679530618889 has 2 divisors, whose sum is σ = 679530618890. Its totient is φ = 679530618888.

The previous prime is 679530618839. The next prime is 679530618901. The reversal of 679530618889 is 988816035976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 666291815289 + 13238803600 = 816267^2 + 115060^2 .

It is a cyclic number.

It is not a de Polignac number, because 679530618889 - 2²³ = 679522230281 is a prime.

It is not a weakly prime, because it can be changed into another prime (679530618839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339765309444 + 339765309445.

It is an arithmetic number, because the mean of its divisors is an integer number (339765309445).

Almost surely, 2^679530618889 is an apocalyptic number.

It is an amenable number.

679530618889 is a deficient number, since it is larger than the sum of its proper divisors (1).

679530618889 is an equidigital number, since it uses as much as digits as its factorization.

679530618889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 156764160, while the sum is 70.

The spelling of 679530618889 in words is "six hundred seventy-nine billion, five hundred thirty million, six hundred eighteen thousand, eight hundred eighty-nine".