257795977 has 2 divisors, whose sum is σ = 257795978. Its totient is φ = 257795976.

The previous prime is 257795963. The next prime is 257796001. The reversal of 257795977 is 779597752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 257795136 + 841 = 16056^2 + 29^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257795977 is a prime.

It is not a weakly prime, because it can be changed into another prime (257735977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128897988 + 128897989.

It is an arithmetic number, because the mean of its divisors is an integer number (128897989).

Almost surely, 2^257795977 is an apocalyptic number.

It is an amenable number.

257795977 is a deficient number, since it is larger than the sum of its proper divisors (1).

257795977 is an equidigital number, since it uses as much as digits as its factorization.

257795977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9724050, while the sum is 58.

The square root of 257795977 is about 16056.0261895651. The cubic root of 257795977 is about 636.4418242748.

The spelling of 257795977 in words is "two hundred fifty-seven million, seven hundred ninety-five thousand, nine hundred seventy-seven".