16518841920 has 560 divisors, whose sum is σ = 67660040448. Its totient is φ = 3747409920.

The previous prime is 16518841849. The next prime is 16518841951. The reversal of 16518841920 is 2914881561.

It is a happy number.

16518841920 is a `hidden beast` number, since 1 + 6 + 518 + 8 + 41 + 92 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (560).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 32840389 + ... + 32840891.

Almost surely, 2^16518841920 is an apocalyptic number.

16518841920 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 16518841920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33830020224).

16518841920 is an abundant number, since it is smaller than the sum of its proper divisors (51141198528).

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

16518841920 is a wasteful number, since it uses less digits than its factorization.

16518841920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 16518841920 in words is "sixteen billion, five hundred eighteen million, eight hundred forty-one thousand, nine hundred twenty".