16645231633 has 4 divisors (see below), whose sum is σ = 16651759168. Its totient is φ = 16638704100.

The previous prime is 16645231627. The next prime is 16645231639. The reversal of 16645231633 is 33613254661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (16645231627) and next prime (16645231639).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16645231633 is a prime.

It is a super-2 number, since 2×16645231633² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16645231639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3259941 + ... + 3265042.

It is an arithmetic number, because the mean of its divisors is an integer number (4162939792).

Almost surely, 2^16645231633 is an apocalyptic number.

It is an amenable number.

16645231633 is a deficient number, since it is larger than the sum of its proper divisors (6527535).

16645231633 is an equidigital number, since it uses as much as digits as its factorization.

16645231633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6527534.

The product of its digits is 233280, while the sum is 40.

The spelling of 16645231633 in words is "sixteen billion, six hundred forty-five million, two hundred thirty-one thousand, six hundred thirty-three".