57918661 has 2 divisors, whose sum is σ = 57918662. Its totient is φ = 57918660.

The previous prime is 57918611. The next prime is 57918667. The reversal of 57918661 is 16681975.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57912100 + 6561 = 7610^2 + 81^2 .

It is a cyclic number.

It is not a de Polignac number, because 57918661 - 2¹⁷ = 57787589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57918667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28959330 + 28959331.

It is an arithmetic number, because the mean of its divisors is an integer number (28959331).

Almost surely, 2^57918661 is an apocalyptic number.

It is an amenable number.

57918661 is a deficient number, since it is larger than the sum of its proper divisors (1).

57918661 is an equidigital number, since it uses as much as digits as its factorization.

57918661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 57918661 is about 7610.4310653208. The cubic root of 57918661 is about 386.9066292738.

The spelling of 57918661 in words is "fifty-seven million, nine hundred eighteen thousand, six hundred sixty-one".