665248979 has 2 divisors, whose sum is σ = 665248980. Its totient is φ = 665248978.

The previous prime is 665248943. The next prime is 665248999. The reversal of 665248979 is 979842566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665248979 - 2²⁸ = 396813523 is a prime.

It is not a weakly prime, because it can be changed into another prime (665248939) 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, 332624489 + 332624490.

It is an arithmetic number, because the mean of its divisors is an integer number (332624490).

Almost surely, 2^665248979 is an apocalyptic number.

665248979 is a deficient number, since it is larger than the sum of its proper divisors (1).

665248979 is an equidigital number, since it uses as much as digits as its factorization.

665248979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 56.

The square root of 665248979 is about 25792.4209604294. The cubic root of 665248979 is about 872.9607931528.

The spelling of 665248979 in words is "six hundred sixty-five million, two hundred forty-eight thousand, nine hundred seventy-nine".