257136770377 has 2 divisors, whose sum is σ = 257136770378. Its totient is φ = 257136770376.

The previous prime is 257136770353. The next prime is 257136770383. The reversal of 257136770377 is 773077631752.

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., 222643366201 + 34493404176 = 471851^2 + 185724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257136770377 is a prime.

It is a super-2 number, since 2×257136770377² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (257136770347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128568385188 + 128568385189.

It is an arithmetic number, because the mean of its divisors is an integer number (128568385189).

Almost surely, 2^257136770377 is an apocalyptic number.

It is an amenable number.

257136770377 is a deficient number, since it is larger than the sum of its proper divisors (1).

257136770377 is an equidigital number, since it uses as much as digits as its factorization.

257136770377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9075780, while the sum is 55.

The spelling of 257136770377 in words is "two hundred fifty-seven billion, one hundred thirty-six million, seven hundred seventy thousand, three hundred seventy-seven".