16605920500 has 48 divisors (see below), whose sum is σ = 39057140304. Its totient is φ = 6131414400.

The previous prime is 16605920483. The next prime is 16605920543. The reversal of 16605920500 is 502950661.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6775594596 + 9830325904 = 82314^2 + 99148^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1270879 + ... + 1283878.

It is an arithmetic number, because the mean of its divisors is an integer number (813690423).

Almost surely, 2^16605920500 is an apocalyptic number.

16605920500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16605920500 is an abundant number, since it is smaller than the sum of its proper divisors (22451219804).

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

16605920500 is a wasteful number, since it uses less digits than its factorization.

16605920500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554789 (or 2554777 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The spelling of 16605920500 in words is "sixteen billion, six hundred five million, nine hundred twenty thousand, five hundred".