22221755661 has 16 divisors (see below), whose sum is σ = 33982236288. Its totient is φ = 12652953600.

The previous prime is 22221755651. The next prime is 22221755669. The reversal of 22221755661 is 16655712222.

It is not a de Polignac number, because 22221755661 - 2⁵ = 22221755629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221755669) 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, 1876980 + ... + 1888781.

It is an arithmetic number, because the mean of its divisors is an integer number (2123889768).

Almost surely, 2^22221755661 is an apocalyptic number.

22221755661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22221755661 is a deficient number, since it is larger than the sum of its proper divisors (11760480627).

22221755661 is a wasteful number, since it uses less digits than its factorization.

22221755661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766052.

The product of its digits is 100800, while the sum is 39.

The spelling of 22221755661 in words is "twenty-two billion, two hundred twenty-one million, seven hundred fifty-five thousand, six hundred sixty-one".