646630079 has 2 divisors, whose sum is σ = 646630080. Its totient is φ = 646630078.

The previous prime is 646630069. The next prime is 646630099. The reversal of 646630079 is 970036646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646630079 - 2⁴ = 646630063 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646630069) 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, 323315039 + 323315040.

It is an arithmetic number, because the mean of its divisors is an integer number (323315040).

Almost surely, 2^646630079 is an apocalyptic number.

646630079 is a deficient number, since it is larger than the sum of its proper divisors (1).

646630079 is an equidigital number, since it uses as much as digits as its factorization.

646630079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 646630079 is about 25428.9220966993. The cubic root of 646630079 is about 864.7395070243.

The spelling of 646630079 in words is "six hundred forty-six million, six hundred thirty thousand, seventy-nine".