2686664399 has 2 divisors, whose sum is σ = 2686664400. Its totient is φ = 2686664398.

The previous prime is 2686664389. The next prime is 2686664443. The reversal of 2686664399 is 9934666862.

2686664399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2686664399 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2686664389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343332199 + 1343332200.

It is an arithmetic number, because the mean of its divisors is an integer number (1343332200).

Almost surely, 2^2686664399 is an apocalyptic number.

2686664399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2686664399 is an equidigital number, since it uses as much as digits as its factorization.

2686664399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20155392, while the sum is 59.

The square root of 2686664399 is about 51833.0435050847. The cubic root of 2686664399 is about 1390.1803328651.

The spelling of 2686664399 in words is "two billion, six hundred eighty-six million, six hundred sixty-four thousand, three hundred ninety-nine".