1256875701257 has 4 divisors (see below), whose sum is σ = 1371137128656. Its totient is φ = 1142614273860.

The previous prime is 1256875701241. The next prime is 1256875701371. The reversal of 1256875701257 is 7521075786521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1256875701257 - 2⁴ = 1256875701241 is a prime.

It is a super-2 number, since 2×1256875701257² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256875701217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57130713683 + ... + 57130713704.

It is an arithmetic number, because the mean of its divisors is an integer number (342784282164).

Almost surely, 2^{1256875701257} is an apocalyptic number.

It is an amenable number.

1256875701257 is a deficient number, since it is larger than the sum of its proper divisors (114261427399).

1256875701257 is a wasteful number, since it uses less digits than its factorization.

1256875701257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114261427398.

The product of its (nonzero) digits is 8232000, while the sum is 56.

The spelling of 1256875701257 in words is "one trillion, two hundred fifty-six billion, eight hundred seventy-five million, seven hundred one thousand, two hundred fifty-seven".