256593677 has 2 divisors, whose sum is σ = 256593678. Its totient is φ = 256593676.

The previous prime is 256593637. The next prime is 256593679. The reversal of 256593677 is 776395652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213481321 + 43112356 = 14611^2 + 6566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256593677 is a prime.

Together with 256593679, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256593679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128296838 + 128296839.

It is an arithmetic number, because the mean of its divisors is an integer number (128296839).

Almost surely, 2^256593677 is an apocalyptic number.

It is an amenable number.

256593677 is a deficient number, since it is larger than the sum of its proper divisors (1).

256593677 is an equidigital number, since it uses as much as digits as its factorization.

256593677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2381400, while the sum is 50.

The square root of 256593677 is about 16018.5416627107. The cubic root of 256593677 is about 635.4508770048.

The spelling of 256593677 in words is "two hundred fifty-six million, five hundred ninety-three thousand, six hundred seventy-seven".