16621615332 has 72 divisors (see below), whose sum is σ = 49189201152. Its totient is φ = 4633200000.

The previous prime is 16621615327. The next prime is 16621615369. The reversal of 16621615332 is 23351612661.

16621615332 is a `hidden beast` number, since 1 + 6 + 6 + 2 + 1 + 615 + 3 + 32 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 794044 + ... + 814707.

Almost surely, 2^16621615332 is an apocalyptic number.

16621615332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16621615332 is an abundant number, since it is smaller than the sum of its proper divisors (32567585820).

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

16621615332 is a wasteful number, since it uses less digits than its factorization.

16621615332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608809 (or 1608804 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The spelling of 16621615332 in words is "sixteen billion, six hundred twenty-one million, six hundred fifteen thousand, three hundred thirty-two".