55664566 has 16 divisors (see below), whose sum is σ = 88187760. Its totient is φ = 26278560.

The previous prime is 55664563. The next prime is 55664597. The reversal of 55664566 is 66546655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55664563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9736 + ... + 14356.

It is an arithmetic number, because the mean of its divisors is an integer number (5511735).

Almost surely, 2^55664566 is an apocalyptic number.

55664566 is a deficient number, since it is larger than the sum of its proper divisors (32523194).

55664566 is a wasteful number, since it uses less digits than its factorization.

55664566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4959.

The product of its digits is 648000, while the sum is 43.

The square root of 55664566 is about 7460.8689842404. The cubic root of 55664566 is about 381.8208227434.

The spelling of 55664566 in words is "fifty-five million, six hundred sixty-four thousand, five hundred sixty-six".