684664336379 has 2 divisors, whose sum is σ = 684664336380. Its totient is φ = 684664336378.

The previous prime is 684664336327. The next prime is 684664336423. The reversal of 684664336379 is 973633466486.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684664336379 - 2⁸ = 684664336123 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (684664336319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342332168189 + 342332168190.

It is an arithmetic number, because the mean of its divisors is an integer number (342332168190).

Almost surely, 2^684664336379 is an apocalyptic number.

684664336379 is a deficient number, since it is larger than the sum of its proper divisors (1).

684664336379 is an equidigital number, since it uses as much as digits as its factorization.

684664336379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282175488, while the sum is 65.

The spelling of 684664336379 in words is "six hundred eighty-four billion, six hundred sixty-four million, three hundred thirty-six thousand, three hundred seventy-nine".