679443646397 has 2 divisors, whose sum is σ = 679443646398. Its totient is φ = 679443646396.

The previous prime is 679443646379. The next prime is 679443646463. The reversal of 679443646397 is 793646344976.

Together with previous prime (679443646379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621029106916 + 58414539481 = 788054^2 + 241691^2 .

It is a cyclic number.

It is not a de Polignac number, because 679443646397 - 2¹² = 679443642301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679443646307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339721823198 + 339721823199.

It is an arithmetic number, because the mean of its divisors is an integer number (339721823199).

Almost surely, 2^679443646397 is an apocalyptic number.

It is an amenable number.

679443646397 is a deficient number, since it is larger than the sum of its proper divisors (1).

679443646397 is an equidigital number, since it uses as much as digits as its factorization.

679443646397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493807104, while the sum is 68.

The spelling of 679443646397 in words is "six hundred seventy-nine billion, four hundred forty-three million, six hundred forty-six thousand, three hundred ninety-seven".