16620668331 has 4 divisors (see below), whose sum is σ = 22160891112. Its totient is φ = 11080445552.

The previous prime is 16620668303. The next prime is 16620668333. The reversal of 16620668331 is 13386602661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16620668331 - 2⁷ = 16620668203 is a prime.

It is a super-2 number, since 2×16620668331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16620668333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2770111386 + ... + 2770111391.

It is an arithmetic number, because the mean of its divisors is an integer number (5540222778).

Almost surely, 2^16620668331 is an apocalyptic number.

16620668331 is a deficient number, since it is larger than the sum of its proper divisors (5540222781).

16620668331 is an equidigital number, since it uses as much as digits as its factorization.

16620668331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5540222780.

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 16620668331 in words is "sixteen billion, six hundred twenty million, six hundred sixty-eight thousand, three hundred thirty-one".