1256457812973 has 16 divisors (see below), whose sum is σ = 1827604886016. Its totient is φ = 761477131440.

The previous prime is 1256457812969. The next prime is 1256457813011. The reversal of 1256457812973 is 3792187546521.

It is not a de Polignac number, because 1256457812973 - 2² = 1256457812969 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256457812473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1991586 + ... + 2545452.

It is an arithmetic number, because the mean of its divisors is an integer number (114225305376).

Almost surely, 2^{1256457812973} is an apocalyptic number.

It is an amenable number.

1256457812973 is a deficient number, since it is larger than the sum of its proper divisors (571147073043).

1256457812973 is a wasteful number, since it uses less digits than its factorization.

1256457812973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622624.

The product of its digits is 25401600, while the sum is 60.

The spelling of 1256457812973 in words is "one trillion, two hundred fifty-six billion, four hundred fifty-seven million, eight hundred twelve thousand, nine hundred seventy-three".