57563661 has 4 divisors (see below), whose sum is σ = 76751552. Its totient is φ = 38375772.

The previous prime is 57563651. The next prime is 57563677. The reversal of 57563661 is 16636575.

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 not a de Polignac number, because 57563661 - 2⁵ = 57563629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57563651) 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, 9593941 + ... + 9593946.

It is an arithmetic number, because the mean of its divisors is an integer number (19187888).

Almost surely, 2^57563661 is an apocalyptic number.

It is an amenable number.

57563661 is a deficient number, since it is larger than the sum of its proper divisors (19187891).

57563661 is a wasteful number, since it uses less digits than its factorization.

57563661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19187890.

The product of its digits is 113400, while the sum is 39.

The square root of 57563661 is about 7587.0719648623. The cubic root of 57563661 is about 386.1145216674.

The spelling of 57563661 in words is "fifty-seven million, five hundred sixty-three thousand, six hundred sixty-one".