256490142277 has 2 divisors, whose sum is σ = 256490142278. Its totient is φ = 256490142276.

The previous prime is 256490142269. The next prime is 256490142281. The reversal of 256490142277 is 772241094652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255954034561 + 536107716 = 505919^2 + 23154^2 .

It is a cyclic number.

It is not a de Polignac number, because 256490142277 - 2³ = 256490142269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256490142277.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256490142877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128245071138 + 128245071139.

It is an arithmetic number, because the mean of its divisors is an integer number (128245071139).

Almost surely, 2^256490142277 is an apocalyptic number.

It is an amenable number.

256490142277 is a deficient number, since it is larger than the sum of its proper divisors (1).

256490142277 is an equidigital number, since it uses as much as digits as its factorization.

256490142277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 256490142277 in words is "two hundred fifty-six billion, four hundred ninety million, one hundred forty-two thousand, two hundred seventy-seven".