13165999805 has 8 divisors (see below), whose sum is σ = 18056228352. Its totient is φ = 9028114128.

The previous prime is 13165999799. The next prime is 13165999811. The reversal of 13165999805 is 50899956131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13165999799) and next prime (13165999811).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13165999805 - 2¹⁶ = 13165934269 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188085677 + ... + 188085746.

It is an arithmetic number, because the mean of its divisors is an integer number (2257028544).

Almost surely, 2^13165999805 is an apocalyptic number.

It is an amenable number.

13165999805 is a deficient number, since it is larger than the sum of its proper divisors (4890228547).

13165999805 is an equidigital number, since it uses as much as digits as its factorization.

13165999805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376171435.

The product of its (nonzero) digits is 2624400, while the sum is 56.

The spelling of 13165999805 in words is "thirteen billion, one hundred sixty-five million, nine hundred ninety-nine thousand, eight hundred five".