18664125380 has 12 divisors (see below), whose sum is σ = 39194663340. Its totient is φ = 7465650144.

The previous prime is 18664125379. The next prime is 18664125383. The reversal of 18664125380 is 8352146681.

It can be written as a sum of positive squares in 2 ways, for example, as 2690704384 + 15973420996 = 51872^2 + 126386^2 .

It is not an unprimeable number, because it can be changed into a prime (18664125383) 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 3 ways as a sum of consecutive naturals, for example, 466603115 + ... + 466603154.

It is an arithmetic number, because the mean of its divisors is an integer number (3266221945).

Almost surely, 2^18664125380 is an apocalyptic number.

18664125380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18664125380 is an abundant number, since it is smaller than the sum of its proper divisors (20530537960).

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

18664125380 is a wasteful number, since it uses less digits than its factorization.

18664125380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933206278 (or 933206276 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 18664125380 in words is "eighteen billion, six hundred sixty-four million, one hundred twenty-five thousand, three hundred eighty".