13679978717 has 2 divisors, whose sum is σ = 13679978718. Its totient is φ = 13679978716.

The previous prime is 13679978651. The next prime is 13679978827. The reversal of 13679978717 is 71787997631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8101980121 + 5577998596 = 90011^2 + 74686^2 .

It is a cyclic number.

It is not a de Polignac number, because 13679978717 - 2²⁴ = 13663201501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13679968717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6839989358 + 6839989359.

It is an arithmetic number, because the mean of its divisors is an integer number (6839989359).

Almost surely, 2^13679978717 is an apocalyptic number.

It is an amenable number.

13679978717 is a deficient number, since it is larger than the sum of its proper divisors (1).

13679978717 is an equidigital number, since it uses as much as digits as its factorization.

13679978717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28005264, while the sum is 65.

The spelling of 13679978717 in words is "thirteen billion, six hundred seventy-nine million, nine hundred seventy-eight thousand, seven hundred seventeen".