695559979 has 2 divisors, whose sum is σ = 695559980. Its totient is φ = 695559978.

The previous prime is 695559971. The next prime is 695560001. The reversal of 695559979 is 979955596.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 695559979 - 2³ = 695559971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 695559979.

It is not a weakly prime, because it can be changed into another prime (695559971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347779989 + 347779990.

It is an arithmetic number, because the mean of its divisors is an integer number (347779990).

Almost surely, 2^695559979 is an apocalyptic number.

695559979 is a deficient number, since it is larger than the sum of its proper divisors (1).

695559979 is an equidigital number, since it uses as much as digits as its factorization.

695559979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34445250, while the sum is 64.

The square root of 695559979 is about 26373.4711215646. The cubic root of 695559979 is about 886.0227269214.

The spelling of 695559979 in words is "six hundred ninety-five million, five hundred fifty-nine thousand, nine hundred seventy-nine".