2668712781859 has 2 divisors, whose sum is σ = 2668712781860. Its totient is φ = 2668712781858.

The previous prime is 2668712781803. The next prime is 2668712781869. The reversal of 2668712781859 is 9581872178662.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2668712781859 - 2¹⁵ = 2668712749091 is a prime.

It is not a weakly prime, because it can be changed into another prime (2668712781869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1334356390929 + 1334356390930.

It is an arithmetic number, because the mean of its divisors is an integer number (1334356390930).

Almost surely, 2^{2668712781859} is an apocalyptic number.

2668712781859 is a deficient number, since it is larger than the sum of its proper divisors (1).

2668712781859 is an equidigital number, since it uses as much as digits as its factorization.

2668712781859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162570240, while the sum is 70.

The spelling of 2668712781859 in words is "two trillion, six hundred sixty-eight billion, seven hundred twelve million, seven hundred eighty-one thousand, eight hundred fifty-nine".