2168686679 has 2 divisors, whose sum is σ = 2168686680. Its totient is φ = 2168686678.

The previous prime is 2168686669. The next prime is 2168686769. The reversal of 2168686679 is 9766868612.

Together with next prime (2168686769) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2168686679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2168686649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084343339 + 1084343340.

It is an arithmetic number, because the mean of its divisors is an integer number (1084343340).

Almost surely, 2^2168686679 is an apocalyptic number.

2168686679 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168686679 is an equidigital number, since it uses as much as digits as its factorization.

2168686679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 59.

The square root of 2168686679 is about 46569.1601706537. The cubic root of 2168686679 is about 1294.3913557312.

The spelling of 2168686679 in words is "two billion, one hundred sixty-eight million, six hundred eighty-six thousand, six hundred seventy-nine".