16655566644 has 36 divisors (see below), whose sum is σ = 42353691744. Its totient is φ = 5518608912.

The previous prime is 16655566639. The next prime is 16655566651. The reversal of 16655566644 is 44666555661.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1379182 + ... + 1391205.

Almost surely, 2^16655566644 is an apocalyptic number.

It is an amenable number.

16655566644 is an abundant number, since it is smaller than the sum of its proper divisors (25698125100).

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

16655566644 is a wasteful number, since it uses less digits than its factorization.

16655566644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2770564 (or 2770559 counting only the distinct ones).

The product of its digits is 15552000, while the sum is 54.

The spelling of 16655566644 in words is "sixteen billion, six hundred fifty-five million, five hundred sixty-six thousand, six hundred forty-four".