18880886979840 has 288 divisors, whose sum is σ = 61778056475520. Its totient is φ = 4911844589568.

The previous prime is 18880886979791. The next prime is 18880886979881. The reversal of 18880886979840 is 4897968808881.

It is a congruent number.

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, 136815514 + ... + 136953446.

It is an arithmetic number, because the mean of its divisors is an integer number (214507140540).

Almost surely, 2^{18880886979840} is an apocalyptic number.

18880886979840 is a gapful number since it is divisible by the number (10) 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 18880886979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30889028237760).

18880886979840 is an abundant number, since it is smaller than the sum of its proper divisors (42897169495680).

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

18880886979840 is a wasteful number, since it uses less digits than its factorization.

18880886979840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138829 (or 138815 counting only the distinct ones).

The product of its (nonzero) digits is 3567255552, while the sum is 84.

The spelling of 18880886979840 in words is "eighteen trillion, eight hundred eighty billion, eight hundred eighty-six million, nine hundred seventy-nine thousand, eight hundred forty".