265838496256872 has 768 divisors, whose sum is σ = 945006034452480. Its totient is φ = 68003410809600.

The previous prime is 265838496256871. The next prime is 265838496256987. The reversal of 265838496256872 is 278652694838562.

265838496256872 is a `hidden beast` number, since 2 + 6 + 5 + 8 + 3 + 8 + 49 + 6 + 2 + 568 + 7 + 2 = 666.

It is a super-2 number, since 2×265838496256872² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a junction number, because it is equal to n+sod(n) for n = 265838496256791 and 265838496256800.

It is not an unprimeable number, because it can be changed into a prime (265838496256871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 10277116083 + ... + 10277141949.

It is an arithmetic number, because the mean of its divisors is an integer number (1230476607360).

Almost surely, 2^{265838496256872} is an apocalyptic number.

265838496256872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265838496256872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (472503017226240).

265838496256872 is an abundant number, since it is smaller than the sum of its proper divisors (679167538195608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

265838496256872 is a wasteful number, since it uses less digits than its factorization.

265838496256872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26944 (or 26928 counting only the distinct ones).

The product of its digits is 16721510400, while the sum is 81.

The spelling of 265838496256872 in words is "two hundred sixty-five trillion, eight hundred thirty-eight billion, four hundred ninety-six million, two hundred fifty-six thousand, eight hundred seventy-two".