13396666861 has 2 divisors, whose sum is σ = 13396666862. Its totient is φ = 13396666860.

The previous prime is 13396666837. The next prime is 13396666867. The reversal of 13396666861 is 16866669331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8004701961 + 5391964900 = 89469^2 + 73430^2 .

It is a cyclic number.

It is not a de Polignac number, because 13396666861 - 2²⁷ = 13262449133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13396666867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6698333430 + 6698333431.

It is an arithmetic number, because the mean of its divisors is an integer number (6698333431).

Almost surely, 2^13396666861 is an apocalyptic number.

It is an amenable number.

13396666861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13396666861 is an equidigital number, since it uses as much as digits as its factorization.

13396666861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5038848, while the sum is 55.

The spelling of 13396666861 in words is "thirteen billion, three hundred ninety-six million, six hundred sixty-six thousand, eight hundred sixty-one".