16646623344 has 60 divisors (see below), whose sum is σ = 50171078776. Its totient is φ = 5122037376.

The previous prime is 16646623327. The next prime is 16646623351. The reversal of 16646623344 is 44332664661.

16646623344 is a `hidden beast` number, since 16 + 6 + 4 + 6 + 623 + 3 + 4 + 4 = 666.

It is a super-2 number, since 2×16646623344² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 16646623344.

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, 4444342 + ... + 4448085.

Almost surely, 2^16646623344 is an apocalyptic number.

It is an amenable number.

16646623344 is an abundant number, since it is smaller than the sum of its proper divisors (33524455432).

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

16646623344 is a wasteful number, since it uses less digits than its factorization.

16646623344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8892454 (or 8892445 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 45.

The spelling of 16646623344 in words is "sixteen billion, six hundred forty-six million, six hundred twenty-three thousand, three hundred forty-four".