18931863132 has 384 divisors, whose sum is σ = 64115896320. Its totient is φ = 4694215680.

The previous prime is 18931863121. The next prime is 18931863151. The reversal of 18931863132 is 23136813981.

18931863132 is a `hidden beast` number, since 1 + 8 + 9 + 3 + 1 + 8 + 631 + 3 + 2 = 666.

It is a congruent number.

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 127 ways as a sum of consecutive naturals, for example, 13787998 + ... + 13789370.

It is an arithmetic number, because the mean of its divisors is an integer number (166968480).

Almost surely, 2^18931863132 is an apocalyptic number.

18931863132 is a gapful number since it is divisible by the number (12) 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 18931863132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32057948160).

18931863132 is an abundant number, since it is smaller than the sum of its proper divisors (45184033188).

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

18931863132 is a wasteful number, since it uses less digits than its factorization.

18931863132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490 (or 1482 counting only the distinct ones).

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

The spelling of 18931863132 in words is "eighteen billion, nine hundred thirty-one million, eight hundred sixty-three thousand, one hundred thirty-two".