13778320605 has 64 divisors (see below), whose sum is σ = 26097942528. Its totient is φ = 6074254080.

The previous prime is 13778320583. The next prime is 13778320639. The reversal of 13778320605 is 50602387731.

It is not a de Polignac number, because 13778320605 - 2²⁵ = 13744766173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 946492 + ... + 960938.

It is an arithmetic number, because the mean of its divisors is an integer number (407780352).

Almost surely, 2^13778320605 is an apocalyptic number.

13778320605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13778320605 is a deficient number, since it is larger than the sum of its proper divisors (12319621923).

13778320605 is a wasteful number, since it uses less digits than its factorization.

13778320605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14786.

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 13778320605 in words is "thirteen billion, seven hundred seventy-eight million, three hundred twenty thousand, six hundred five".