64645979 has 2 divisors, whose sum is σ = 64645980. Its totient is φ = 64645978.

The previous prime is 64645967. The next prime is 64646027. The reversal of 64645979 is 97954646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64645979 - 2¹⁶ = 64580443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64645279) 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, 32322989 + 32322990.

It is an arithmetic number, because the mean of its divisors is an integer number (32322990).

Almost surely, 2^64645979 is an apocalyptic number.

64645979 is a deficient number, since it is larger than the sum of its proper divisors (1).

64645979 is an equidigital number, since it uses as much as digits as its factorization.

64645979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 50.

The square root of 64645979 is about 8040.2723212588. The cubic root of 64645979 is about 401.3412869296.

The spelling of 64645979 in words is "sixty-four million, six hundred forty-five thousand, nine hundred seventy-nine".