13666866631 has 6 divisors (see below), whose sum is σ = 15022258496. Its totient is φ = 12424424100.

The previous prime is 13666866599. The next prime is 13666866679.

13666866631 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 13666866631 - 2⁵ = 13666866599 is a prime.

It is a super-2 number, since 2×13666866631² (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 (13666866131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56474535 + ... + 56474776.

Almost surely, 2^13666866631 is an apocalyptic number.

13666866631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13666866631 is a deficient number, since it is larger than the sum of its proper divisors (1355391865).

13666866631 is a wasteful number, since it uses less digits than its factorization.

13666866631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112949333 (or 112949322 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 52.

The spelling of 13666866631 in words is "thirteen billion, six hundred sixty-six million, eight hundred sixty-six thousand, six hundred thirty-one".