13612433661 has 6 divisors (see below), whose sum is σ = 19662404190. Its totient is φ = 9074955768.

The previous prime is 13612433633. The next prime is 13612433713. The reversal of 13612433661 is 16633421631.

13612433661 is a `hidden beast` number, since 1 + 3 + 612 + 4 + 3 + 36 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10049060025 + 3563373636 = 100245^2 + 59694^2 .

It is not a de Polignac number, because 13612433661 - 2⁵ = 13612433629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13612433561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 756246306 + ... + 756246323.

It is an arithmetic number, because the mean of its divisors is an integer number (3277067365).

Almost surely, 2^13612433661 is an apocalyptic number.

It is an amenable number.

13612433661 is a deficient number, since it is larger than the sum of its proper divisors (6049970529).

13612433661 is a wasteful number, since it uses less digits than its factorization.

13612433661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512492635 (or 1512492632 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The spelling of 13612433661 in words is "thirteen billion, six hundred twelve million, four hundred thirty-three thousand, six hundred sixty-one".