16631554663 has 16 divisors (see below), whose sum is σ = 17342519040. Its totient is φ = 15936467904.

The previous prime is 16631554609. The next prime is 16631554717. The reversal of 16631554663 is 36645513661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16631554609) and next prime (16631554717).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16631554663 is a prime.

It is a super-2 number, since 2×16631554663² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16631554363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1269595 + ... + 1282627.

It is an arithmetic number, because the mean of its divisors is an integer number (1083907440).

Almost surely, 2^16631554663 is an apocalyptic number.

16631554663 is a deficient number, since it is larger than the sum of its proper divisors (710964377).

16631554663 is a wasteful number, since it uses less digits than its factorization.

16631554663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13638.

The product of its digits is 1166400, while the sum is 46.

The spelling of 16631554663 in words is "sixteen billion, six hundred thirty-one million, five hundred fifty-four thousand, six hundred sixty-three".