265328009856 has 1152 divisors, whose sum is σ = 1007784806400. Its totient is φ = 68474585088.

The previous prime is 265328009839. The next prime is 265328009857. The reversal of 265328009856 is 658900823562.

265328009856 is a `hidden beast` number, since 26 + 532 + 8 + 0 + 0 + 9 + 85 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (265328009857) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2089196865 + ... + 2089196991.

It is an arithmetic number, because the mean of its divisors is an integer number (874813200).

Almost surely, 2^265328009856 is an apocalyptic number.

265328009856 is a gapful number since it is divisible by the number (26) 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 265328009856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (503892403200).

265328009856 is an abundant number, since it is smaller than the sum of its proper divisors (742456796544).

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

265328009856 is a wasteful number, since it uses less digits than its factorization.

265328009856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 265328009856 in words is "two hundred sixty-five billion, three hundred twenty-eight million, nine thousand, eight hundred fifty-six".