57657332321 has 2 divisors, whose sum is σ = 57657332322. Its totient is φ = 57657332320.

The previous prime is 57657332287. The next prime is 57657332353. The reversal of 57657332321 is 12323375675.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37475152225 + 20182180096 = 193585^2 + 142064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57657332321 is a prime.

It is not a weakly prime, because it can be changed into another prime (57657332371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28828666160 + 28828666161.

It is an arithmetic number, because the mean of its divisors is an integer number (28828666161).

Almost surely, 2^57657332321 is an apocalyptic number.

It is an amenable number.

57657332321 is a deficient number, since it is larger than the sum of its proper divisors (1).

57657332321 is an equidigital number, since it uses as much as digits as its factorization.

57657332321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 44.

The spelling of 57657332321 in words is "fifty-seven billion, six hundred fifty-seven million, three hundred thirty-two thousand, three hundred twenty-one".