23384220561 has 45 divisors (see below), whose sum is σ = 37854720651. Its totient is φ = 14379279408.

The previous prime is 23384220547. The next prime is 23384220611. The reversal of 23384220561 is 16502248332.

The square root of 23384220561 is 152919.

It is a perfect power (a square), and thus also a powerful number.

23384220561 is a `hidden beast` number, since 2 + 3 + 38 + 42 + 20 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3459204225 + 19925016336 = 58815^2 + 141156^2 .

It is not a de Polignac number, because 23384220561 - 2²⁷ = 23250002833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23384220961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 17890870 + ... + 17892176.

Almost surely, 2^23384220561 is an apocalyptic number.

23384220561 is the 152919-th square number.

23384220561 is the 76460-th centered octagonal number.

It is an amenable number.

23384220561 is a deficient number, since it is larger than the sum of its proper divisors (14470500090).

23384220561 is an frugal number, since it uses more digits than its factorization.

23384220561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652 (or 1323 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Multiplying 23384220561 by its sum of digits (36), we get a square (841831940196 = 917514²).

Adding to 23384220561 its reverse (16502248332), we get a palindrome (39886468893).

The spelling of 23384220561 in words is "twenty-three billion, three hundred eighty-four million, two hundred twenty thousand, five hundred sixty-one".