679877976917 has 2 divisors, whose sum is σ = 679877976918. Its totient is φ = 679877976916.

The previous prime is 679877976797. The next prime is 679877977021. The reversal of 679877976917 is 719679778976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434378537476 + 245499439441 = 659074^2 + 495479^2 .

It is a cyclic number.

It is not a de Polignac number, because 679877976917 - 2¹⁰ = 679877975893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679877876917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339938988458 + 339938988459.

It is an arithmetic number, because the mean of its divisors is an integer number (339938988459).

Almost surely, 2^679877976917 is an apocalyptic number.

It is an amenable number.

679877976917 is a deficient number, since it is larger than the sum of its proper divisors (1).

679877976917 is an equidigital number, since it uses as much as digits as its factorization.

679877976917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528663264, while the sum is 83.

The spelling of 679877976917 in words is "six hundred seventy-nine billion, eight hundred seventy-seven million, nine hundred seventy-six thousand, nine hundred seventeen".