679886617 has 2 divisors, whose sum is σ = 679886618. Its totient is φ = 679886616.

The previous prime is 679886609. The next prime is 679886629. The reversal of 679886617 is 716688976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656179456 + 23707161 = 25616^2 + 4869^2 .

It is a cyclic number.

It is not a de Polignac number, because 679886617 - 2³ = 679886609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (679886657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339943308 + 339943309.

It is an arithmetic number, because the mean of its divisors is an integer number (339943309).

Almost surely, 2^679886617 is an apocalyptic number.

It is an amenable number.

679886617 is a deficient number, since it is larger than the sum of its proper divisors (1).

679886617 is an equidigital number, since it uses as much as digits as its factorization.

679886617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 58.

The square root of 679886617 is about 26074.6355103959. The cubic root of 679886617 is about 879.3170566425.

The spelling of 679886617 in words is "six hundred seventy-nine million, eight hundred eighty-six thousand, six hundred seventeen".