13815013805 has 8 divisors (see below), whose sum is σ = 16588031352. Its totient is φ = 11045334528.

The previous prime is 13815013801. The next prime is 13815013819. The reversal of 13815013805 is 50831051831.

It can be written as a sum of positive squares in 4 ways, for example, as 16752649 + 13798261156 = 4093^2 + 117466^2 .

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 13815013805 - 2² = 13815013801 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13815013801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 825452 + ... + 842021.

It is an arithmetic number, because the mean of its divisors is an integer number (2073503919).

Almost surely, 2^13815013805 is an apocalyptic number.

It is an amenable number.

13815013805 is a deficient number, since it is larger than the sum of its proper divisors (2773017547).

13815013805 is a wasteful number, since it uses less digits than its factorization.

13815013805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669135.

The product of its (nonzero) digits is 14400, while the sum is 35.

The spelling of 13815013805 in words is "thirteen billion, eight hundred fifteen million, thirteen thousand, eight hundred five".