55221646566 has 16 divisors (see below), whose sum is σ = 110445597504. Its totient is φ = 18406831464.

The previous prime is 55221646559. The next prime is 55221646591. The reversal of 55221646566 is 66564612255.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502681 + ... + 602603.

It is an arithmetic number, because the mean of its divisors is an integer number (6902849844).

Almost surely, 2^55221646566 is an apocalyptic number.

55221646566 is an abundant number, since it is smaller than the sum of its proper divisors (55223950938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55221646566 is a wasteful number, since it uses less digits than its factorization.

55221646566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192035.

The product of its digits is 2592000, while the sum is 48.

The spelling of 55221646566 in words is "fifty-five billion, two hundred twenty-one million, six hundred forty-six thousand, five hundred sixty-six".