55638657 has 10 divisors (see below), whose sum is σ = 83114658. Its totient is φ = 37092384.

The previous prime is 55638641. The next prime is 55638659. The reversal of 55638657 is 75683655.

55638657 is a `hidden beast` number, since 5 + 5 + 638 + 6 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 54997056 + 641601 = 7416^2 + 801^2 .

It is not a de Polignac number, because 55638657 - 2⁴ = 55638641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55638659) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 343368 + ... + 343529.

Almost surely, 2^55638657 is an apocalyptic number.

It is an amenable number.

55638657 is a deficient number, since it is larger than the sum of its proper divisors (27476001).

55638657 is an equidigital number, since it uses as much as digits as its factorization.

55638657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686909 (or 686900 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The square root of 55638657 is about 7459.1324562579. The cubic root of 55638657 is about 381.7615742146.

The spelling of 55638657 in words is "fifty-five million, six hundred thirty-eight thousand, six hundred fifty-seven".