16642665331 has 2 divisors, whose sum is σ = 16642665332. Its totient is φ = 16642665330.

The previous prime is 16642665317. The next prime is 16642665349. The reversal of 16642665331 is 13356624661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16642665331 - 2¹⁵ = 16642632563 is a prime.

It is a super-2 number, since 2×16642665331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16642665311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321332665 + 8321332666.

It is an arithmetic number, because the mean of its divisors is an integer number (8321332666).

Almost surely, 2^16642665331 is an apocalyptic number.

16642665331 is a deficient number, since it is larger than the sum of its proper divisors (1).

16642665331 is an equidigital number, since it uses as much as digits as its factorization.

16642665331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 43.

The spelling of 16642665331 in words is "sixteen billion, six hundred forty-two million, six hundred sixty-five thousand, three hundred thirty-one".