16642650321 has 48 divisors (see below), whose sum is σ = 27237150720. Its totient is φ = 9704369760.

The previous prime is 16642650317. The next prime is 16642650379. The reversal of 16642650321 is 12305624661.

16642650321 is a `hidden beast` number, since 1 + 6 + 642 + 6 + 5 + 0 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 16642650321 - 2² = 16642650317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16642650301) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 244216 + ... + 304838.

It is an arithmetic number, because the mean of its divisors is an integer number (567440640).

Almost surely, 2^16642650321 is an apocalyptic number.

16642650321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16642650321 is a deficient number, since it is larger than the sum of its proper divisors (10594500399).

16642650321 is a wasteful number, since it uses less digits than its factorization.

16642650321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60746 (or 60743 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 16642650321 in words is "sixteen billion, six hundred forty-two million, six hundred fifty thousand, three hundred twenty-one".