22218900631566 has 128 divisors (see below), whose sum is σ = 50094687168000. Its totient is φ = 6528257961984.

The previous prime is 22218900631553. The next prime is 22218900631667. The reversal of 22218900631566 is 66513600981222.

It is a happy number.

It is a super-2 number, since 2×22218900631566² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

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 63 ways as a sum of consecutive naturals, for example, 1177525180 + ... + 1177544048.

It is an arithmetic number, because the mean of its divisors is an integer number (391364743500).

Almost surely, 2^{22218900631566} is an apocalyptic number.

22218900631566 is an abundant number, since it is smaller than the sum of its proper divisors (27875786536434).

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

22218900631566 is a wasteful number, since it uses less digits than its factorization.

22218900631566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25826.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 22218900631566 in words is "twenty-two trillion, two hundred eighteen billion, nine hundred million, six hundred thirty-one thousand, five hundred sixty-six".