55651666 has 32 divisors (see below), whose sum is σ = 98703360. Its totient is φ = 23039376.

The previous prime is 55651639. The next prime is 55651669. The reversal of 55651666 is 66615655.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (55651669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54105 + ... + 55123.

It is an arithmetic number, because the mean of its divisors is an integer number (3084480).

Almost surely, 2^55651666 is an apocalyptic number.

55651666 is a deficient number, since it is larger than the sum of its proper divisors (43051694).

55651666 is a wasteful number, since it uses less digits than its factorization.

55651666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158.

The product of its digits is 162000, while the sum is 40.

The square root of 55651666 is about 7460.0044235912. The cubic root of 55651666 is about 381.7913254078.

The spelling of 55651666 in words is "fifty-five million, six hundred fifty-one thousand, six hundred sixty-six".