664140979 has 2 divisors, whose sum is σ = 664140980. Its totient is φ = 664140978.

The previous prime is 664140959. The next prime is 664141003. The reversal of 664140979 is 979041466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664140979 - 2¹¹ = 664138931 is a prime.

It is not a weakly prime, because it can be changed into another prime (664140959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332070489 + 332070490.

It is an arithmetic number, because the mean of its divisors is an integer number (332070490).

Almost surely, 2^664140979 is an apocalyptic number.

664140979 is a deficient number, since it is larger than the sum of its proper divisors (1).

664140979 is an equidigital number, since it uses as much as digits as its factorization.

664140979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 664140979 is about 25770.9328313897. The cubic root of 664140979 is about 872.4758729299.

The spelling of 664140979 in words is "six hundred sixty-four million, one hundred forty thousand, nine hundred seventy-nine".