16918791856400 has 120 divisors (see below), whose sum is σ = 46485504362304. Its totient is φ = 5796815731200.

The previous prime is 16918791856349. The next prime is 16918791856411. The reversal of 16918791856400 is 465819781961.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2115170 + ... + 6189630.

Almost surely, 2^{16918791856400} is an apocalyptic number.

16918791856400 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 16918791856400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23242752181152).

16918791856400 is an abundant number, since it is smaller than the sum of its proper divisors (29566712505904).

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

16918791856400 is a wasteful number, since it uses less digits than its factorization.

16918791856400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4075969 (or 4075958 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 65.

The spelling of 16918791856400 in words is "sixteen trillion, nine hundred eighteen billion, seven hundred ninety-one million, eight hundred fifty-six thousand, four hundred".