257171554021939 has 2 divisors, whose sum is σ = 257171554021940. Its totient is φ = 257171554021938.

The previous prime is 257171554021901. The next prime is 257171554022039. The reversal of 257171554021939 is 939120455171752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257171554021939 - 2⁹ = 257171554021427 is a prime.

It is a super-2 number, since 2×257171554021939² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (257171554021439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128585777010969 + 128585777010970.

It is an arithmetic number, because the mean of its divisors is an integer number (128585777010970).

Almost surely, 2^{257171554021939} is an apocalyptic number.

257171554021939 is a deficient number, since it is larger than the sum of its proper divisors (1).

257171554021939 is an equidigital number, since it uses as much as digits as its factorization.

257171554021939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814000, while the sum is 61.

The spelling of 257171554021939 in words is "two hundred fifty-seven trillion, one hundred seventy-one billion, five hundred fifty-four million, twenty-one thousand, nine hundred thirty-nine".