256402151077 has 2 divisors, whose sum is σ = 256402151078. Its totient is φ = 256402151076.

The previous prime is 256402151063. The next prime is 256402151149. The reversal of 256402151077 is 770151204652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162480741921 + 93921409156 = 403089^2 + 306466^2 .

It is a cyclic number.

It is not a de Polignac number, because 256402151077 - 2²⁷ = 256267933349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256402151017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128201075538 + 128201075539.

It is an arithmetic number, because the mean of its divisors is an integer number (128201075539).

Almost surely, 2^256402151077 is an apocalyptic number.

It is an amenable number.

256402151077 is a deficient number, since it is larger than the sum of its proper divisors (1).

256402151077 is an equidigital number, since it uses as much as digits as its factorization.

256402151077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 256402151077 in words is "two hundred fifty-six billion, four hundred two million, one hundred fifty-one thousand, seventy-seven".