16601616331 has 2 divisors, whose sum is σ = 16601616332. Its totient is φ = 16601616330.

The previous prime is 16601616319. The next prime is 16601616347. The reversal of 16601616331 is 13361610661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16601616331 - 2²¹ = 16599519179 is a prime.

It is a super-2 number, since 2×16601616331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16601616391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8300808165 + 8300808166.

It is an arithmetic number, because the mean of its divisors is an integer number (8300808166).

Almost surely, 2^16601616331 is an apocalyptic number.

16601616331 is a deficient number, since it is larger than the sum of its proper divisors (1).

16601616331 is an equidigital number, since it uses as much as digits as its factorization.

16601616331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 16601616331 in words is "sixteen billion, six hundred one million, six hundred sixteen thousand, three hundred thirty-one".