55918664 has 8 divisors (see below), whose sum is σ = 104847510. Its totient is φ = 27959328.

The previous prime is 55918663. The next prime is 55918679. The reversal of 55918664 is 46681955.

It can be written as a sum of positive squares in only one way, i.e., 41705764 + 14212900 = 6458^2 + 3770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (55918663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494909 + ... + 3494924.

Almost surely, 2^55918664 is an apocalyptic number.

It is an amenable number.

55918664 is a deficient number, since it is larger than the sum of its proper divisors (48928846).

55918664 is a wasteful number, since it uses less digits than its factorization.

55918664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6989839 (or 6989835 counting only the distinct ones).

The product of its digits is 259200, while the sum is 44.

The square root of 55918664 is about 7477.8783087183. The cubic root of 55918664 is about 382.4009204123.

The spelling of 55918664 in words is "fifty-five million, nine hundred eighteen thousand, six hundred sixty-four".