13808155815 has 24 divisors (see below), whose sum is σ = 23942140560. Its totient is φ = 7361887104.

The previous prime is 13808155807. The next prime is 13808155841. The reversal of 13808155815 is 51855180831.

13808155815 is a `hidden beast` number, since 1 + 3 + 8 + 0 + 81 + 558 + 15 = 666.

It is not a de Polignac number, because 13808155815 - 2³ = 13808155807 is a prime.

It is a super-2 number, since 2×13808155815² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88971 + ... + 188499.

It is an arithmetic number, because the mean of its divisors is an integer number (997589190).

Almost surely, 2^13808155815 is an apocalyptic number.

13808155815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13808155815 is a deficient number, since it is larger than the sum of its proper divisors (10133984745).

13808155815 is a wasteful number, since it uses less digits than its factorization.

13808155815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102623 (or 102620 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 45.

The spelling of 13808155815 in words is "thirteen billion, eight hundred eight million, one hundred fifty-five thousand, eight hundred fifteen".