18639164160 has 864 divisors, whose sum is σ = 72854046720. Its totient is φ = 4379443200.

The previous prime is 18639164153. The next prime is 18639164197. The reversal of 18639164160 is 6146193681.

18639164160 is a `hidden beast` number, since 1 + 8 + 639 + 1 + 6 + 4 + 1 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 278196447 + ... + 278196513.

Almost surely, 2^18639164160 is an apocalyptic number.

18639164160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18639164160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36427023360).

18639164160 is an abundant number, since it is smaller than the sum of its proper divisors (54214882560).

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

18639164160 is a wasteful number, since it uses less digits than its factorization.

18639164160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 18639164160 in words is "eighteen billion, six hundred thirty-nine million, one hundred sixty-four thousand, one hundred sixty".