679544779 has 2 divisors, whose sum is σ = 679544780. Its totient is φ = 679544778.

The previous prime is 679544777. The next prime is 679544813. The reversal of 679544779 is 977445976.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 679544779 - 2¹ = 679544777 is a prime.

It is a super-2 number, since 2×679544779² = 923562213332317682, which contains 22 as substring.

Together with 679544777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (679544773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339772389 + 339772390.

It is an arithmetic number, because the mean of its divisors is an integer number (339772390).

Almost surely, 2^679544779 is an apocalyptic number.

679544779 is a deficient number, since it is larger than the sum of its proper divisors (1).

679544779 is an equidigital number, since it uses as much as digits as its factorization.

679544779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13335840, while the sum is 58.

The square root of 679544779 is about 26068.0796952902. The cubic root of 679544779 is about 879.1696622745.

The spelling of 679544779 in words is "six hundred seventy-nine million, five hundred forty-four thousand, seven hundred seventy-nine".