256631157355127 has 2 divisors, whose sum is σ = 256631157355128. Its totient is φ = 256631157355126.

The previous prime is 256631157355099. The next prime is 256631157355151. The reversal of 256631157355127 is 721553751136652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256631157355127 - 2¹² = 256631157351031 is a prime.

It is a super-2 number, since 2×256631157355127² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256631157355187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128315578677563 + 128315578677564.

It is an arithmetic number, because the mean of its divisors is an integer number (128315578677564).

Almost surely, 2^{256631157355127} is an apocalyptic number.

256631157355127 is a deficient number, since it is larger than the sum of its proper divisors (1).

256631157355127 is an equidigital number, since it uses as much as digits as its factorization.

256631157355127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690000, while the sum is 59.

The spelling of 256631157355127 in words is "two hundred fifty-six trillion, six hundred thirty-one billion, one hundred fifty-seven million, three hundred fifty-five thousand, one hundred twenty-seven".