13684398991 has 16 divisors (see below), whose sum is σ = 14280013440. Its totient is φ = 13103868960.

The previous prime is 13684398979. The next prime is 13684399019. The reversal of 13684398991 is 19989348631.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13684398991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13684398901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452905 + ... + 482173.

It is an arithmetic number, because the mean of its divisors is an integer number (892500840).

Almost surely, 2^13684398991 is an apocalyptic number.

13684398991 is a deficient number, since it is larger than the sum of its proper divisors (595614449).

13684398991 is a wasteful number, since it uses less digits than its factorization.

13684398991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29526.

The product of its digits is 10077696, while the sum is 61.

The spelling of 13684398991 in words is "thirteen billion, six hundred eighty-four million, three hundred ninety-eight thousand, nine hundred ninety-one".