57543661 has 4 divisors (see below), whose sum is σ = 65764192. Its totient is φ = 49323132.

The previous prime is 57543653. The next prime is 57543671. The reversal of 57543661 is 16634575.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57543661 - 2³ = 57543653 is a prime.

It is a super-2 number, since 2×57543661² = 6622545842565842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57543661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57543641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4110255 + ... + 4110268.

It is an arithmetic number, because the mean of its divisors is an integer number (16441048).

Almost surely, 2^57543661 is an apocalyptic number.

It is an amenable number.

57543661 is a deficient number, since it is larger than the sum of its proper divisors (8220531).

57543661 is an equidigital number, since it uses as much as digits as its factorization.

57543661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8220530.

The product of its digits is 75600, while the sum is 37.

The square root of 57543661 is about 7585.7538188370. The cubic root of 57543661 is about 386.0697990952.

The spelling of 57543661 in words is "fifty-seven million, five hundred forty-three thousand, six hundred sixty-one".