1256375631945 has 32 divisors (see below), whose sum is σ = 2297480122368. Its totient is φ = 574316261568.

The previous prime is 1256375631923. The next prime is 1256375632021. The reversal of 1256375631945 is 5491365736521.

It is not a de Polignac number, because 1256375631945 - 2⁷ = 1256375631817 is a prime.

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, 2067012 + ... + 2604858.

It is an arithmetic number, because the mean of its divisors is an integer number (71796253824).

Almost surely, 2^{1256375631945} is an apocalyptic number.

1256375631945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1256375631945 is a deficient number, since it is larger than the sum of its proper divisors (1041104490423).

1256375631945 is a wasteful number, since it uses less digits than its factorization.

1256375631945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560109.

The product of its digits is 20412000, while the sum is 57.

The spelling of 1256375631945 in words is "one trillion, two hundred fifty-six billion, three hundred seventy-five million, six hundred thirty-one thousand, nine hundred forty-five".