55640566 has 16 divisors (see below), whose sum is σ = 85333824. Its totient is φ = 27199744.

The previous prime is 55640537. The next prime is 55640579. The reversal of 55640566 is 66504655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36675 + ... + 38161.

It is an arithmetic number, because the mean of its divisors is an integer number (5333364).

Almost surely, 2^55640566 is an apocalyptic number.

55640566 is a deficient number, since it is larger than the sum of its proper divisors (29693258).

55640566 is a wasteful number, since it uses less digits than its factorization.

55640566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895.

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 55640566 is about 7459.2604191032. The cubic root of 55640566 is about 381.7659403307.

The spelling of 55640566 in words is "fifty-five million, six hundred forty thousand, five hundred sixty-six".