256401527377 has 2 divisors, whose sum is σ = 256401527378. Its totient is φ = 256401527376.

The previous prime is 256401527357. The next prime is 256401527387. The reversal of 256401527377 is 773725104652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192812322816 + 63589204561 = 439104^2 + 252169^2 .

It is a cyclic number.

It is not a de Polignac number, because 256401527377 - 2³⁵ = 222041789009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256401527377.

It is not a weakly prime, because it can be changed into another prime (256401527357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128200763688 + 128200763689.

It is an arithmetic number, because the mean of its divisors is an integer number (128200763689).

Almost surely, 2^256401527377 is an apocalyptic number.

It is an amenable number.

256401527377 is a deficient number, since it is larger than the sum of its proper divisors (1).

256401527377 is an equidigital number, since it uses as much as digits as its factorization.

256401527377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2469600, while the sum is 49.

The spelling of 256401527377 in words is "two hundred fifty-six billion, four hundred one million, five hundred twenty-seven thousand, three hundred seventy-seven".