1256213660635 has 32 divisors (see below), whose sum is σ = 1592573488128. Its totient is φ = 949322816640.

The previous prime is 1256213660627. The next prime is 1256213660677. The reversal of 1256213660635 is 5360663126521.

It is not a de Polignac number, because 1256213660635 - 2³ = 1256213660627 is a prime.

It is a super-2 number, since 2×1256213660635² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25680250 + ... + 25729120.

It is an arithmetic number, because the mean of its divisors is an integer number (49767921504).

Almost surely, 2^{1256213660635} is an apocalyptic number.

1256213660635 is a deficient number, since it is larger than the sum of its proper divisors (336359827493).

1256213660635 is a wasteful number, since it uses less digits than its factorization.

1256213660635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51675.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 1256213660635 in words is "one trillion, two hundred fifty-six billion, two hundred thirteen million, six hundred sixty thousand, six hundred thirty-five".