13166506641 has 4 divisors (see below), whose sum is σ = 17555342192. Its totient is φ = 8777671092.

The previous prime is 13166506621. The next prime is 13166506649. The reversal of 13166506641 is 14660566131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13166506641 - 2¹⁹ = 13165982353 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 13166506641.

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, 2194417771 + ... + 2194417776.

It is an arithmetic number, because the mean of its divisors is an integer number (4388835548).

Almost surely, 2^13166506641 is an apocalyptic number.

It is an amenable number.

13166506641 is a deficient number, since it is larger than the sum of its proper divisors (4388835551).

13166506641 is an equidigital number, since it uses as much as digits as its factorization.

13166506641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4388835550.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 13166506641 in words is "thirteen billion, one hundred sixty-six million, five hundred six thousand, six hundred forty-one".