16644917780 has 48 divisors (see below), whose sum is σ = 35201537280. Its totient is φ = 6610958208.

The previous prime is 16644917767. The next prime is 16644917819. The reversal of 16644917780 is 8771944661.

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, 5335061 + ... + 5338179.

It is an arithmetic number, because the mean of its divisors is an integer number (733365360).

Almost surely, 2^16644917780 is an apocalyptic number.

16644917780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16644917780 is an abundant number, since it is smaller than the sum of its proper divisors (18556619500).

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

16644917780 is a wasteful number, since it uses less digits than its factorization.

16644917780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4928 (or 4926 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 16644917780 in words is "sixteen billion, six hundred forty-four million, nine hundred seventeen thousand, seven hundred eighty".