13660195817 has 4 divisors (see below), whose sum is σ = 13801022676. Its totient is φ = 13519368960.

The previous prime is 13660195799. The next prime is 13660195847. The reversal of 13660195817 is 71859106631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7818803776 + 5841392041 = 88424^2 + 76429^2 .

It is a cyclic number.

It is not a de Polignac number, because 13660195817 - 2¹⁴ = 13660179433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13660195847) 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, 70413284 + ... + 70413477.

It is an arithmetic number, because the mean of its divisors is an integer number (3450255669).

Almost surely, 2^13660195817 is an apocalyptic number.

It is an amenable number.

13660195817 is a deficient number, since it is larger than the sum of its proper divisors (140826859).

13660195817 is an equidigital number, since it uses as much as digits as its factorization.

13660195817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140826858.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 13660195817 in words is "thirteen billion, six hundred sixty million, one hundred ninety-five thousand, eight hundred seventeen".