17666812679 has 2 divisors, whose sum is σ = 17666812680. Its totient is φ = 17666812678.

The previous prime is 17666812643. The next prime is 17666812721. The reversal of 17666812679 is 97621866671.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17666812679 - 2²⁸ = 17398377223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17666812979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8833406339 + 8833406340.

It is an arithmetic number, because the mean of its divisors is an integer number (8833406340).

Almost surely, 2^17666812679 is an apocalyptic number.

17666812679 is a deficient number, since it is larger than the sum of its proper divisors (1).

17666812679 is an equidigital number, since it uses as much as digits as its factorization.

17666812679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 59.

The spelling of 17666812679 in words is "seventeen billion, six hundred sixty-six million, eight hundred twelve thousand, six hundred seventy-nine".