13345646661 has 48 divisors (see below), whose sum is σ = 21325624320. Its totient is φ = 8013012480.

The previous prime is 13345646653. The next prime is 13345646693. The reversal of 13345646661 is 16664654331.

13345646661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13345646661 - 2³ = 13345646653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13345646161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 209325 + ... + 265533.

It is an arithmetic number, because the mean of its divisors is an integer number (444283840).

Almost surely, 2^13345646661 is an apocalyptic number.

It is an amenable number.

13345646661 is a deficient number, since it is larger than the sum of its proper divisors (7979977659).

13345646661 is a wasteful number, since it uses less digits than its factorization.

13345646661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56306 (or 56303 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The spelling of 13345646661 in words is "thirteen billion, three hundred forty-five million, six hundred forty-six thousand, six hundred sixty-one".