18159025166820 has 96 divisors (see below), whose sum is σ = 58951038263040. Its totient is φ = 4631867285760.

The previous prime is 18159025166803. The next prime is 18159025166869. The reversal of 18159025166820 is 2866152095181.

18159025166820 is a `hidden beast` number, since 1 + 8 + 1 + 590 + 25 + 1 + 6 + 6 + 8 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 731027241 + ... + 731052080.

It is an arithmetic number, because the mean of its divisors is an integer number (614073315240).

Almost surely, 2^{18159025166820} is an apocalyptic number.

18159025166820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18159025166820 is an abundant number, since it is smaller than the sum of its proper divisors (40792013096220).

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

18159025166820 is a wasteful number, since it uses less digits than its factorization.

18159025166820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1462079362 (or 1462079354 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 18159025166820 in words is "eighteen trillion, one hundred fifty-nine billion, twenty-five million, one hundred sixty-six thousand, eight hundred twenty".