22661211555 has 48 divisors (see below), whose sum is σ = 41375543040. Its totient is φ = 11441908800.

The previous prime is 22661211553. The next prime is 22661211563. The reversal of 22661211555 is 55511216622.

22661211555 is a `hidden beast` number, since 2 + 26 + 61 + 21 + 1 + 555 = 666.

It is not a de Polignac number, because 22661211555 - 2¹ = 22661211553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22661211553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1334770 + ... + 1351640.

It is an arithmetic number, because the mean of its divisors is an integer number (861990480).

Almost surely, 2^22661211555 is an apocalyptic number.

22661211555 is a deficient number, since it is larger than the sum of its proper divisors (18714331485).

22661211555 is a wasteful number, since it uses less digits than its factorization.

22661211555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18472 (or 18469 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The spelling of 22661211555 in words is "twenty-two billion, six hundred sixty-one million, two hundred eleven thousand, five hundred fifty-five".