1256663644342 has 32 divisors (see below), whose sum is σ = 1969358635008. Its totient is φ = 600278100576.

The previous prime is 1256663644339. The next prime is 1256663644351. The reversal of 1256663644342 is 2434463666521.

It is a super-2 number, since 2×1256663644342² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1256663644342.

It is a congruent 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, 204565323 + ... + 204571465.

It is an arithmetic number, because the mean of its divisors is an integer number (61542457344).

Almost surely, 2^{1256663644342} is an apocalyptic number.

1256663644342 is a deficient number, since it is larger than the sum of its proper divisors (712694990666).

1256663644342 is a wasteful number, since it uses less digits than its factorization.

1256663644342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10884.

The product of its digits is 14929920, while the sum is 52.

The spelling of 1256663644342 in words is "one trillion, two hundred fifty-six billion, six hundred sixty-three million, six hundred forty-four thousand, three hundred forty-two".