16651561100 has 18 divisors (see below), whose sum is σ = 36133887804. Its totient is φ = 6660624400.

The previous prime is 16651561097. The next prime is 16651561111. The reversal of 16651561100 is 116515661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83257706 + ... + 83257905.

Almost surely, 2^16651561100 is an apocalyptic number.

16651561100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16651561100 is an abundant number, since it is smaller than the sum of its proper divisors (19482326704).

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

16651561100 is a wasteful number, since it uses less digits than its factorization.

16651561100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166515625 (or 166515618 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 16651561100 in words is "sixteen billion, six hundred fifty-one million, five hundred sixty-one thousand, one hundred".