1256600631265 has 16 divisors (see below), whose sum is σ = 1798265749248. Its totient is φ = 824205134016.

The previous prime is 1256600631241. The next prime is 1256600631271. The reversal of 1256600631265 is 5621360066521.

It is a cyclic number.

It is not a de Polignac number, because 1256600631265 - 2⁵ = 1256600631233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 780496482 + ... + 780498091.

It is an arithmetic number, because the mean of its divisors is an integer number (112391609328).

Almost surely, 2^{1256600631265} is an apocalyptic number.

It is an amenable number.

1256600631265 is a deficient number, since it is larger than the sum of its proper divisors (541665117983).

1256600631265 is a wasteful number, since it uses less digits than its factorization.

1256600631265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560994608.

The product of its (nonzero) digits is 388800, while the sum is 43.

Adding to 1256600631265 its reverse (5621360066521), we get a palindrome (6877960697786).

The spelling of 1256600631265 in words is "one trillion, two hundred fifty-six billion, six hundred million, six hundred thirty-one thousand, two hundred sixty-five".