23566561920 has 384 divisors, whose sum is σ = 89084923200. Its totient is φ = 5693276160.

The previous prime is 23566561877. The next prime is 23566561939. The reversal of 23566561920 is 2916566532.

23566561920 is a `hidden beast` number, since 2 + 3 + 5 + 6 + 6 + 5 + 619 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27434451 + ... + 27435309.

Almost surely, 2^23566561920 is an apocalyptic number.

23566561920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23566561920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44542461600).

23566561920 is an abundant number, since it is smaller than the sum of its proper divisors (65518361280).

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

23566561920 is a wasteful number, since it uses less digits than its factorization.

23566561920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328 (or 1313 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 23566561920 in words is "twenty-three billion, five hundred sixty-six million, five hundred sixty-one thousand, nine hundred twenty".