13855090905 has 24 divisors (see below), whose sum is σ = 24904955712. Its totient is φ = 7389381168.

The previous prime is 13855090897. The next prime is 13855090939. The reversal of 13855090905 is 50909055831.

13855090905 is a `hidden beast` number, since 1 + 3 + 8 + 550 + 9 + 0 + 90 + 5 = 666.

It is not a de Polignac number, because 13855090905 - 2³ = 13855090897 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

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, 5700469 + ... + 5702898.

It is an arithmetic number, because the mean of its divisors is an integer number (1037706488).

Almost surely, 2^13855090905 is an apocalyptic number.

13855090905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13855090905 is a deficient number, since it is larger than the sum of its proper divisors (11049864807).

13855090905 is an equidigital number, since it uses as much as digits as its factorization.

13855090905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11403387 (or 11403375 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The spelling of 13855090905 in words is "thirteen billion, eight hundred fifty-five million, ninety thousand, nine hundred five".