13758978817 has 4 divisors (see below), whose sum is σ = 13763393280. Its totient is φ = 13754564356.

The previous prime is 13758978799. The next prime is 13758978851. The reversal of 13758978817 is 71887985731.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13758978817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13758978517) 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, 2202553 + ... + 2208790.

It is an arithmetic number, because the mean of its divisors is an integer number (3440848320).

Almost surely, 2^13758978817 is an apocalyptic number.

It is an amenable number.

13758978817 is a deficient number, since it is larger than the sum of its proper divisors (4414463).

13758978817 is an equidigital number, since it uses as much as digits as its factorization.

13758978817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4414462.

The product of its digits is 23708160, while the sum is 64.

The spelling of 13758978817 in words is "thirteen billion, seven hundred fifty-eight million, nine hundred seventy-eight thousand, eight hundred seventeen".