23487718581 has 32 divisors (see below), whose sum is σ = 35026992000. Its totient is φ = 15555006720.

The previous prime is 23487718487. The next prime is 23487718589. The reversal of 23487718581 is 18581778432.

23487718581 is a `hidden beast` number, since 2 + 3 + 48 + 7 + 7 + 18 + 581 = 666.

It is not a de Polignac number, because 23487718581 - 2⁷ = 23487718453 is a prime.

It is a super-2 number, since 2×23487718581² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23487718589) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5798845 + ... + 5802893.

It is an arithmetic number, because the mean of its divisors is an integer number (1094593500).

Almost surely, 2^23487718581 is an apocalyptic number.

It is an amenable number.

23487718581 is a deficient number, since it is larger than the sum of its proper divisors (11539273419).

23487718581 is a wasteful number, since it uses less digits than its factorization.

23487718581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5426 (or 5420 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The spelling of 23487718581 in words is "twenty-three billion, four hundred eighty-seven million, seven hundred eighteen thousand, five hundred eighty-one".