18564372378 has 24 divisors (see below), whose sum is σ = 41309911188. Its totient is φ = 6020877312.

The previous prime is 18564372311. The next prime is 18564372391. The reversal of 18564372378 is 87327346581.

It is a happy number.

18564372378 is a `hidden beast` number, since 1 + 8 + 564 + 3 + 7 + 2 + 3 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14128412769 + 4435959609 = 118863^2 + 66603^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13936551 + ... + 13937882.

Almost surely, 2^18564372378 is an apocalyptic number.

18564372378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18564372378 is an abundant number, since it is smaller than the sum of its proper divisors (22745538810).

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

18564372378 is a wasteful number, since it uses less digits than its factorization.

18564372378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27874478 (or 27874475 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The spelling of 18564372378 in words is "eighteen billion, five hundred sixty-four million, three hundred seventy-two thousand, three hundred seventy-eight".