13666066631 has 12 divisors (see below), whose sum is σ = 15901637472. Its totient is φ = 11710546848.

The previous prime is 13666066507. The next prime is 13666066637.

It is a happy number.

13666066631 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 13666066631 - 2¹⁰ = 13666065607 is a prime.

It is a super-2 number, since 2×13666066631² (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 (13666066637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150851 + ... + 223803.

It is an arithmetic number, because the mean of its divisors is an integer number (1325136456).

Almost surely, 2^13666066631 is an apocalyptic number.

13666066631 is a deficient number, since it is larger than the sum of its proper divisors (2235570841).

13666066631 is an equidigital number, since it uses as much as digits as its factorization.

13666066631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76790 (or 76783 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 44.

The spelling of 13666066631 in words is "thirteen billion, six hundred sixty-six million, sixty-six thousand, six hundred thirty-one".