13778090865 has 48 divisors (see below), whose sum is σ = 29774998656. Its totient is φ = 5725958400.

The previous prime is 13778090857. The next prime is 13778090881. The reversal of 13778090865 is 56809087731.

It is not a de Polignac number, because 13778090865 - 2³ = 13778090857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1984716 + ... + 1991645.

It is an arithmetic number, because the mean of its divisors is an integer number (620312472).

Almost surely, 2^13778090865 is an apocalyptic number.

13778090865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13778090865 is an abundant number, since it is smaller than the sum of its proper divisors (15996907791).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13778090865 is a wasteful number, since it uses less digits than its factorization.

13778090865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3976390 (or 3976387 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 13778090865 in words is "thirteen billion, seven hundred seventy-eight million, ninety thousand, eight hundred sixty-five".