57665981 has 2 divisors, whose sum is σ = 57665982. Its totient is φ = 57665980.

The previous prime is 57665963. The next prime is 57666013. The reversal of 57665981 is 18956675.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52693081 + 4972900 = 7259^2 + 2230^2 .

It is a cyclic number.

It is not a de Polignac number, because 57665981 - 2¹⁴ = 57649597 is a prime.

It is a super-2 number, since 2×57665981² = 6650730729384722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57665911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28832990 + 28832991.

It is an arithmetic number, because the mean of its divisors is an integer number (28832991).

Almost surely, 2^57665981 is an apocalyptic number.

It is an amenable number.

57665981 is a deficient number, since it is larger than the sum of its proper divisors (1).

57665981 is an equidigital number, since it uses as much as digits as its factorization.

57665981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 47.

The square root of 57665981 is about 7593.8120203229. The cubic root of 57665981 is about 386.3431604306.

The spelling of 57665981 in words is "fifty-seven million, six hundred sixty-five thousand, nine hundred eighty-one".