13816786815 has 72 divisors (see below), whose sum is σ = 26893928880. Its totient is φ = 6802009344.

The previous prime is 13816786811. The next prime is 13816786829. The reversal of 13816786815 is 51868761831.

It is not a de Polignac number, because 13816786815 - 2² = 13816786811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13816786811) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 171691 + ... + 238979.

It is an arithmetic number, because the mean of its divisors is an integer number (373526790).

Almost surely, 2^13816786815 is an apocalyptic number.

13816786815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13816786815 is a deficient number, since it is larger than the sum of its proper divisors (13077142065).

13816786815 is an equidigital number, since it uses as much as digits as its factorization.

13816786815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67335 (or 67310 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 13816786815 in words is "thirteen billion, eight hundred sixteen million, seven hundred eighty-six thousand, eight hundred fifteen".