23022721566 has 48 divisors (see below), whose sum is σ = 55171587744. Its totient is φ = 6892454592.

The previous prime is 23022721549. The next prime is 23022721571. The reversal of 23022721566 is 66512722032.

23022721566 is a `hidden beast` number, since 2 + 3 + 0 + 22 + 72 + 1 + 566 = 666.

It is a super-2 number, since 2×23022721566² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23022721566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1320906 + ... + 1338221.

It is an arithmetic number, because the mean of its divisors is an integer number (1149408078).

Almost surely, 2^23022721566 is an apocalyptic number.

23022721566 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

23022721566 is an abundant number, since it is smaller than the sum of its proper divisors (32148866178).

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

23022721566 is a wasteful number, since it uses less digits than its factorization.

23022721566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659185 (or 2659182 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 23022721566 in words is "twenty-three billion, twenty-two million, seven hundred twenty-one thousand, five hundred sixty-six".