256347000577 has 2 divisors, whose sum is σ = 256347000578. Its totient is φ = 256347000576.

The previous prime is 256347000523. The next prime is 256347000587. The reversal of 256347000577 is 775000743652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256310325441 + 36675136 = 506271^2 + 6056^2 .

It is a cyclic number.

It is not a de Polignac number, because 256347000577 - 2³¹ = 254199516929 is a prime.

It is not a weakly prime, because it can be changed into another prime (256347000517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128173500288 + 128173500289.

It is an arithmetic number, because the mean of its divisors is an integer number (128173500289).

Almost surely, 2^256347000577 is an apocalyptic number.

It is an amenable number.

256347000577 is a deficient number, since it is larger than the sum of its proper divisors (1).

256347000577 is an equidigital number, since it uses as much as digits as its factorization.

256347000577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1234800, while the sum is 46.

The spelling of 256347000577 in words is "two hundred fifty-six billion, three hundred forty-seven million, five hundred seventy-seven", and thus it is an aban number.