16631711661 has 16 divisors (see below), whose sum is σ = 22351792320. Its totient is φ = 10999772160.

The previous prime is 16631711647. The next prime is 16631711669. The reversal of 16631711661 is 16611713661.

It is not a de Polignac number, because 16631711661 - 2¹⁰ = 16631710637 is a prime.

It is a super-2 number, since 2×16631711661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16631711669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2335975 + ... + 2343083.

It is an arithmetic number, because the mean of its divisors is an integer number (1396987020).

Almost surely, 2^16631711661 is an apocalyptic number.

It is an amenable number.

16631711661 is a deficient number, since it is larger than the sum of its proper divisors (5720080659).

16631711661 is a wasteful number, since it uses less digits than its factorization.

16631711661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13196.

The product of its digits is 27216, while the sum is 39.

The spelling of 16631711661 in words is "sixteen billion, six hundred thirty-one million, seven hundred eleven thousand, six hundred sixty-one".