23666668840 has 16 divisors (see below), whose sum is σ = 53250004980. Its totient is φ = 9466667520.

The previous prime is 23666668819. The next prime is 23666668849. The reversal of 23666668840 is 4886666632.

It can be written as a sum of positive squares in 2 ways, for example, as 22050468036 + 1616200804 = 148494^2 + 40202^2 .

It is a super-2 number, since 2×23666668840² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23666668849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295833321 + ... + 295833400.

Almost surely, 2^23666668840 is an apocalyptic number.

23666668840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23666668840 is an abundant number, since it is smaller than the sum of its proper divisors (29583336140).

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

23666668840 is a wasteful number, since it uses less digits than its factorization.

23666668840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591666732 (or 591666728 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 55.

The spelling of 23666668840 in words is "twenty-three billion, six hundred sixty-six million, six hundred sixty-eight thousand, eight hundred forty".