22118877661 has 16 divisors (see below), whose sum is σ = 22800758400. Its totient is φ = 21444065280.

The previous prime is 22118877643. The next prime is 22118877707. The reversal of 22118877661 is 16677881122.

It is a cyclic number.

It is not a de Polignac number, because 22118877661 - 2⁷ = 22118877533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22118877461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10466941 + ... + 10469053.

It is an arithmetic number, because the mean of its divisors is an integer number (1425047400).

Almost surely, 2^22118877661 is an apocalyptic number.

It is an amenable number.

22118877661 is a deficient number, since it is larger than the sum of its proper divisors (681880739).

22118877661 is a wasteful number, since it uses less digits than its factorization.

22118877661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636.

The product of its digits is 451584, while the sum is 49.

The spelling of 22118877661 in words is "twenty-two billion, one hundred eighteen million, eight hundred seventy-seven thousand, six hundred sixty-one".