256622376415187 has 2 divisors, whose sum is σ = 256622376415188. Its totient is φ = 256622376415186.

The previous prime is 256622376415133. The next prime is 256622376415189. The reversal of 256622376415187 is 781514673226652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256622376415187 - 2¹⁰ = 256622376414163 is a prime.

Together with 256622376415189, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256622376415189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128311188207593 + 128311188207594.

It is an arithmetic number, because the mean of its divisors is an integer number (128311188207594).

Almost surely, 2^{256622376415187} is an apocalyptic number.

256622376415187 is a deficient number, since it is larger than the sum of its proper divisors (1).

256622376415187 is an equidigital number, since it uses as much as digits as its factorization.

256622376415187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 203212800, while the sum is 65.

The spelling of 256622376415187 in words is "two hundred fifty-six trillion, six hundred twenty-two billion, three hundred seventy-six million, four hundred fifteen thousand, one hundred eighty-seven".