679538595517 has 2 divisors, whose sum is σ = 679538595518. Its totient is φ = 679538595516.

The previous prime is 679538595479. The next prime is 679538595539. The reversal of 679538595517 is 715595835976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 423346723801 + 256191871716 = 650651^2 + 506154^2 .

It is a cyclic number.

It is not a de Polignac number, because 679538595517 - 2¹¹ = 679538593469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679538595217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339769297758 + 339769297759.

It is an arithmetic number, because the mean of its divisors is an integer number (339769297759).

Almost surely, 2^679538595517 is an apocalyptic number.

It is an amenable number.

679538595517 is a deficient number, since it is larger than the sum of its proper divisors (1).

679538595517 is an equidigital number, since it uses as much as digits as its factorization.

679538595517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 357210000, while the sum is 70.

The spelling of 679538595517 in words is "six hundred seventy-nine billion, five hundred thirty-eight million, five hundred ninety-five thousand, five hundred seventeen".