1265860503600 has 960 divisors, whose sum is σ = 5294815395840. Its totient is φ = 250672435200.

The previous prime is 1265860503569. The next prime is 1265860503601. The reversal of 1265860503600 is 63050685621.

It is a happy number.

It is a super-2 number, since 2×1265860503600² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1265860503601) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 673687461 + ... + 673689339.

It is an arithmetic number, because the mean of its divisors is an integer number (5515432704).

Almost surely, 2^{1265860503600} is an apocalyptic number.

1265860503600 is a gapful number since it is divisible by the number (10) 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 1265860503600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2647407697920).

1265860503600 is an abundant number, since it is smaller than the sum of its proper divisors (4028954892240).

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

1265860503600 is a wasteful number, since it uses less digits than its factorization.

1265860503600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258 (or 2247 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 1265860503600 in words is "one trillion, two hundred sixty-five billion, eight hundred sixty million, five hundred three thousand, six hundred".