16605665100 has 54 divisors (see below), whose sum is σ = 52049537540. Its totient is φ = 4428177120.

The previous prime is 16605665099. The next prime is 16605665113. The reversal of 16605665100 is 156650661.

It is a super-2 number, since 2×16605665100² (a number of 21 digits) contains 22 as substring.

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 17 ways as a sum of consecutive naturals, for example, 9224470 + ... + 9226269.

Almost surely, 2^16605665100 is an apocalyptic number.

16605665100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16605665100 is an abundant number, since it is smaller than the sum of its proper divisors (35443872440).

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

16605665100 is a wasteful number, since it uses less digits than its factorization.

16605665100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18450759 (or 18450749 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 16605665100 in words is "sixteen billion, six hundred five million, six hundred sixty-five thousand, one hundred".