13166506643 has 4 divisors (see below), whose sum is σ = 13180123440. Its totient is φ = 13152889848.

The previous prime is 13166506621. The next prime is 13166506649. The reversal of 13166506643 is 34660566131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34660566131 = 1033 ⋅33553307.

It is a cyclic number.

It is not a de Polignac number, because 13166506643 - 2¹⁶ = 13166441107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13166506643.

It is not an unprimeable number, because it can be changed into a prime (13166506649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6806948 + ... + 6808881.

It is an arithmetic number, because the mean of its divisors is an integer number (3295030860).

Almost surely, 2^13166506643 is an apocalyptic number.

13166506643 is a deficient number, since it is larger than the sum of its proper divisors (13616797).

13166506643 is an equidigital number, since it uses as much as digits as its factorization.

13166506643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13616796.

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 13166506643 in words is "thirteen billion, one hundred sixty-six million, five hundred six thousand, six hundred forty-three".