256101570691 has 2 divisors, whose sum is σ = 256101570692. Its totient is φ = 256101570690.

The previous prime is 256101570689. The next prime is 256101570773. The reversal of 256101570691 is 196075101652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256101570691 - 2¹ = 256101570689 is a prime.

Together with 256101570689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (256101570601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128050785345 + 128050785346.

It is an arithmetic number, because the mean of its divisors is an integer number (128050785346).

Almost surely, 2^256101570691 is an apocalyptic number.

256101570691 is a deficient number, since it is larger than the sum of its proper divisors (1).

256101570691 is an equidigital number, since it uses as much as digits as its factorization.

256101570691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 256101570691 in words is "two hundred fifty-six billion, one hundred one million, five hundred seventy thousand, six hundred ninety-one".