1256875131945 has 32 divisors (see below), whose sum is σ = 2076780625920. Its totient is φ = 648425545920.

The previous prime is 1256875131907. The next prime is 1256875131959. The reversal of 1256875131945 is 5491315786521.

It is not a de Polignac number, because 1256875131945 - 2⁸ = 1256875131689 is a prime.

It is a super-2 number, since 2×1256875131945² (a number of 25 digits) contains 22 as substring.

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, 472516 + ... + 1654394.

It is an arithmetic number, because the mean of its divisors is an integer number (64899394560).

Almost surely, 2^{1256875131945} is an apocalyptic number.

1256875131945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1256875131945 is a deficient number, since it is larger than the sum of its proper divisors (819905493975).

1256875131945 is a wasteful number, since it uses less digits than its factorization.

1256875131945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184205.

The product of its digits is 9072000, while the sum is 57.

The spelling of 1256875131945 in words is "one trillion, two hundred fifty-six billion, eight hundred seventy-five million, one hundred thirty-one thousand, nine hundred forty-five".