18939880512 has 224 divisors, whose sum is σ = 65829484800. Its totient is φ = 5224697856.

The previous prime is 18939880501. The next prime is 18939880543. The reversal of 18939880512 is 21508893981.

18939880512 is a `hidden beast` number, since 18 + 9 + 39 + 8 + 80 + 512 = 666.

It is a tau number, because it is divible by the number of its divisors (224).

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323788 + ... + 377780.

Almost surely, 2^18939880512 is an apocalyptic number.

18939880512 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 18939880512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32914742400).

18939880512 is an abundant number, since it is smaller than the sum of its proper divisors (46889604288).

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

18939880512 is a wasteful number, since it uses less digits than its factorization.

18939880512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54050 (or 54034 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The spelling of 18939880512 in words is "eighteen billion, nine hundred thirty-nine million, eight hundred eighty thousand, five hundred twelve".