257532732661 has 2 divisors, whose sum is σ = 257532732662. Its totient is φ = 257532732660.

The previous prime is 257532732623. The next prime is 257532732673. The reversal of 257532732661 is 166237235752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208689080625 + 48843652036 = 456825^2 + 221006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257532732661 is a prime.

It is a super-2 number, since 2×257532732661² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257532732161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128766366330 + 128766366331.

It is an arithmetic number, because the mean of its divisors is an integer number (128766366331).

Almost surely, 2^257532732661 is an apocalyptic number.

It is an amenable number.

257532732661 is a deficient number, since it is larger than the sum of its proper divisors (1).

257532732661 is an equidigital number, since it uses as much as digits as its factorization.

257532732661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3175200, while the sum is 49.

The spelling of 257532732661 in words is "two hundred fifty-seven billion, five hundred thirty-two million, seven hundred thirty-two thousand, six hundred sixty-one".