16638090900 has 36 divisors (see below), whose sum is σ = 48139543872. Its totient is φ = 4436824160.

The previous prime is 16638090881. The next prime is 16638090901. The reversal of 16638090900 is 909083661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16638090901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27729852 + ... + 27730451.

It is an arithmetic number, because the mean of its divisors is an integer number (1337209552).

Almost surely, 2^16638090900 is an apocalyptic number.

16638090900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16638090900 is an abundant number, since it is smaller than the sum of its proper divisors (31501452972).

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

16638090900 is a wasteful number, since it uses less digits than its factorization.

16638090900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55460320 (or 55460313 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The spelling of 16638090900 in words is "sixteen billion, six hundred thirty-eight million, ninety thousand, nine hundred".