256724566700377 has 2 divisors, whose sum is σ = 256724566700378. Its totient is φ = 256724566700376.

The previous prime is 256724566700311. The next prime is 256724566700431. The reversal of 256724566700377 is 773007665427652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234267023854656 + 22457542845721 = 15305784^2 + 4738939^2 .

It is a cyclic number.

It is not a de Polignac number, because 256724566700377 - 2⁷ = 256724566700249 is a prime.

It is not a weakly prime, because it can be changed into another prime (256724566740377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128362283350188 + 128362283350189.

It is an arithmetic number, because the mean of its divisors is an integer number (128362283350189).

Almost surely, 2^{256724566700377} is an apocalyptic number.

It is an amenable number.

256724566700377 is a deficient number, since it is larger than the sum of its proper divisors (1).

256724566700377 is an equidigital number, since it uses as much as digits as its factorization.

256724566700377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622339200, while the sum is 67.

The spelling of 256724566700377 in words is "two hundred fifty-six trillion, seven hundred twenty-four billion, five hundred sixty-six million, seven hundred thousand, three hundred seventy-seven".