18979994163520 has 112 divisors (see below), whose sum is σ = 48674451546000. Its totient is φ = 7007750701056.

The previous prime is 18979994163511. The next prime is 18979994163551. The reversal of 18979994163520 is 2536149997981.

It can be written as a sum of positive squares in 8 ways, for example, as 7989124862016 + 10990869301504 = 2826504^2 + 3315248^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152813764 + ... + 152937916.

It is an arithmetic number, because the mean of its divisors is an integer number (434593317375).

It is a 1-persistent number, because it is pandigital, but 2⋅18979994163520 = 37959988327040 is not.

Almost surely, 2^{18979994163520} is an apocalyptic number.

18979994163520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18979994163520 is an abundant number, since it is smaller than the sum of its proper divisors (29694457382480).

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

18979994163520 is a wasteful number, since it uses less digits than its factorization.

18979994163520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160932 (or 160922 counting only the distinct ones).

The product of its (nonzero) digits is 264539520, while the sum is 73.

The spelling of 18979994163520 in words is "eighteen trillion, nine hundred seventy-nine billion, nine hundred ninety-four million, one hundred sixty-three thousand, five hundred twenty".