257163575777 has 2 divisors, whose sum is σ = 257163575778. Its totient is φ = 257163575776.

The previous prime is 257163575749. The next prime is 257163575803. The reversal of 257163575777 is 777575361752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193530486241 + 63633089536 = 439921^2 + 252256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257163575777 is a prime.

It is a super-2 number, since 2×257163575777² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (257163575077) 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, 128581787888 + 128581787889.

It is an arithmetic number, because the mean of its divisors is an integer number (128581787889).

Almost surely, 2^257163575777 is an apocalyptic number.

It is an amenable number.

257163575777 is a deficient number, since it is larger than the sum of its proper divisors (1).

257163575777 is an equidigital number, since it uses as much as digits as its factorization.

257163575777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75631500, while the sum is 62.

The spelling of 257163575777 in words is "two hundred fifty-seven billion, one hundred sixty-three million, five hundred seventy-five thousand, seven hundred seventy-seven".