16556390532 has 72 divisors (see below), whose sum is σ = 45824268672. Its totient is φ = 4998542400.

The previous prime is 16556390509. The next prime is 16556390573. The reversal of 16556390532 is 23509365561.

16556390532 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 639 + 0 + 5 + 3 + 2 = 666.

It is a super-2 number, since 2×16556390532² (a number of 21 digits) contains 22 as substring.

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, 30178 + ... + 184454.

It is an arithmetic number, because the mean of its divisors is an integer number (636448176).

Almost surely, 2^16556390532 is an apocalyptic number.

16556390532 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 16556390532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22912134336).

16556390532 is an abundant number, since it is smaller than the sum of its proper divisors (29267878140).

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

16556390532 is a wasteful number, since it uses less digits than its factorization.

16556390532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154569 (or 154564 counting only the distinct ones).

The product of its (nonzero) digits is 729000, while the sum is 45.

The spelling of 16556390532 in words is "sixteen billion, five hundred fifty-six million, three hundred ninety thousand, five hundred thirty-two".