18639020160 has 160 divisors (see below), whose sum is σ = 66563491500. Its totient is φ = 4970391552.

The previous prime is 18639020143. The next prime is 18639020161. The reversal of 18639020160 is 6102093681.

18639020160 is a `hidden beast` number, since 1 + 8 + 6 + 390 + 201 + 60 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18263900736 + 375119424 = 135144^2 + 19368^2 .

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18639020161) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 127935 + ... + 231614.

Almost surely, 2^18639020160 is an apocalyptic number.

18639020160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18639020160 is an abundant number, since it is smaller than the sum of its proper divisors (47924471340).

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

18639020160 is an equidigital number, since it uses as much as digits as its factorization.

18639020160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359580 (or 359559 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 18639020160 in words is "eighteen billion, six hundred thirty-nine million, twenty thousand, one hundred sixty".