16013855520 has 672 divisors, whose sum is σ = 62468884800. Its totient is φ = 3853412352.

The previous prime is 16013855509. The next prime is 16013855587. The reversal of 16013855520 is 2555831061.

It is a happy number.

16013855520 is a `hidden beast` number, since 16 + 0 + 13 + 85 + 552 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 89462791 + ... + 89462969.

It is an arithmetic number, because the mean of its divisors is an integer number (92959650).

Almost surely, 2^16013855520 is an apocalyptic number.

16013855520 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 16013855520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31234442400).

16013855520 is an abundant number, since it is smaller than the sum of its proper divisors (46455029280).

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

16013855520 is a wasteful number, since it uses less digits than its factorization.

16013855520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 16013855520 in words is "sixteen billion, thirteen million, eight hundred fifty-five thousand, five hundred twenty".