13665656631 has 48 divisors (see below), whose sum is σ = 20925283680. Its totient is φ = 7916832000.

The previous prime is 13665656621. The next prime is 13665656639.

13665656631 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 13665656631 - 2²¹ = 13663559479 is a prime.

It is a super-2 number, since 2×13665656631² (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 (13665656639) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1056801 + ... + 1069653.

It is an arithmetic number, because the mean of its divisors is an integer number (435943410).

Almost surely, 2^13665656631 is an apocalyptic number.

13665656631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13665656631 is a deficient number, since it is larger than the sum of its proper divisors (7259627049).

13665656631 is a wasteful number, since it uses less digits than its factorization.

13665656631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13008 (or 12997 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 48.

The spelling of 13665656631 in words is "thirteen billion, six hundred sixty-five million, six hundred fifty-six thousand, six hundred thirty-one".