679842408979 has 2 divisors, whose sum is σ = 679842408980. Its totient is φ = 679842408978.

The previous prime is 679842408899. The next prime is 679842409003. The reversal of 679842408979 is 979804248976.

679842408979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-679842408979 is a prime.

It is not a weakly prime, because it can be changed into another prime (679842408779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339921204489 + 339921204490.

It is an arithmetic number, because the mean of its divisors is an integer number (339921204490).

Almost surely, 2^679842408979 is an apocalyptic number.

679842408979 is a deficient number, since it is larger than the sum of its proper divisors (1).

679842408979 is an equidigital number, since it uses as much as digits as its factorization.

679842408979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 438939648, while the sum is 73.

The spelling of 679842408979 in words is "six hundred seventy-nine billion, eight hundred forty-two million, four hundred eight thousand, nine hundred seventy-nine".