55666431 has 6 divisors (see below), whose sum is σ = 80407080. Its totient is φ = 37110948.

The previous prime is 55666427. The next prime is 55666433. The reversal of 55666431 is 13466655.

It is not a de Polignac number, because 55666431 - 2² = 55666427 is a prime.

It is a super-2 number, since 2×55666431² = 6197503080555522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55666433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3092571 + ... + 3092588.

It is an arithmetic number, because the mean of its divisors is an integer number (13401180).

Almost surely, 2^55666431 is an apocalyptic number.

55666431 is a deficient number, since it is larger than the sum of its proper divisors (24740649).

55666431 is a wasteful number, since it uses less digits than its factorization.

55666431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6185165 (or 6185162 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 55666431 is about 7460.9939686345. The cubic root of 55666431 is about 381.8250869036.

The spelling of 55666431 in words is "fifty-five million, six hundred sixty-six thousand, four hundred thirty-one".