13391816385 has 24 divisors (see below), whose sum is σ = 22761461376. Its totient is φ = 6722164480.

The previous prime is 13391816381. The next prime is 13391816461. The reversal of 13391816385 is 58361819331.

It is not a de Polignac number, because 13391816385 - 2² = 13391816381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13391816381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1540281 + ... + 1548950.

It is an arithmetic number, because the mean of its divisors is an integer number (948394224).

Almost surely, 2^13391816385 is an apocalyptic number.

13391816385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13391816385 is a deficient number, since it is larger than the sum of its proper divisors (9369644991).

13391816385 is a wasteful number, since it uses less digits than its factorization.

13391816385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089273 (or 3089256 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The spelling of 13391816385 in words is "thirteen billion, three hundred ninety-one million, eight hundred sixteen thousand, three hundred eighty-five".