13689691397857 has 4 divisors (see below), whose sum is σ = 13689699471616. Its totient is φ = 13689683324100.

The previous prime is 13689691397839. The next prime is 13689691397881. The reversal of 13689691397857 is 75879319698631.

13689691397857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13689691397857 - 2⁷ = 13689691397729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13689691397257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403353 + ... + 5248054.

It is an arithmetic number, because the mean of its divisors is an integer number (3422424867904).

Almost surely, 2^{13689691397857} is an apocalyptic number.

It is an amenable number.

13689691397857 is a deficient number, since it is larger than the sum of its proper divisors (8073759).

13689691397857 is an equidigital number, since it uses as much as digits as its factorization.

13689691397857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8073758.

The product of its digits is 3703553280, while the sum is 82.

The spelling of 13689691397857 in words is "thirteen trillion, six hundred eighty-nine billion, six hundred ninety-one million, three hundred ninety-seven thousand, eight hundred fifty-seven".