679665187 has 2 divisors, whose sum is σ = 679665188. Its totient is φ = 679665186.

The previous prime is 679665149. The next prime is 679665211. The reversal of 679665187 is 781566976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 679665187 - 2⁷ = 679665059 is a prime.

It is not a weakly prime, because it can be changed into another prime (679665127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339832593 + 339832594.

It is an arithmetic number, because the mean of its divisors is an integer number (339832594).

Almost surely, 2^679665187 is an apocalyptic number.

679665187 is a deficient number, since it is larger than the sum of its proper divisors (1).

679665187 is an equidigital number, since it uses as much as digits as its factorization.

679665187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 55.

The square root of 679665187 is about 26070.3890841698. The cubic root of 679665187 is about 879.2215856661.

It can be divided in two parts, 67966 and 5187, that added together give a triangular number (73153 = T₃₈₂).

The spelling of 679665187 in words is "six hundred seventy-nine million, six hundred sixty-five thousand, one hundred eighty-seven".