23221565660 has 48 divisors (see below), whose sum is σ = 49245356160. Its totient is φ = 9197497920.

The previous prime is 23221565657. The next prime is 23221565663. The reversal of 23221565660 is 6656512232.

It is an interprime number because it is at equal distance from previous prime (23221565657) and next prime (23221565663).

It is a super-2 number, since 2×23221565660² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23221565663) 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, 1214051 + ... + 1233029.

It is an arithmetic number, because the mean of its divisors is an integer number (1025944920).

Almost surely, 2^23221565660 is an apocalyptic number.

23221565660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23221565660 is an abundant number, since it is smaller than the sum of its proper divisors (26023790500).

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

23221565660 is a wasteful number, since it uses less digits than its factorization.

23221565660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19586 (or 19584 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 23221565660 in words is "twenty-three billion, two hundred twenty-one million, five hundred sixty-five thousand, six hundred sixty".