664070893 has 2 divisors, whose sum is σ = 664070894. Its totient is φ = 664070892.

The previous prime is 664070873. The next prime is 664070929. The reversal of 664070893 is 398070466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663732169 + 338724 = 25763^2 + 582^2 .

It is a cyclic number.

It is not a de Polignac number, because 664070893 - 2⁵ = 664070861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664070873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332035446 + 332035447.

It is an arithmetic number, because the mean of its divisors is an integer number (332035447).

Almost surely, 2^664070893 is an apocalyptic number.

It is an amenable number.

664070893 is a deficient number, since it is larger than the sum of its proper divisors (1).

664070893 is an equidigital number, since it uses as much as digits as its factorization.

664070893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 664070893 is about 25769.5730077159. The cubic root of 664070893 is about 872.4451814066.

The spelling of 664070893 in words is "six hundred sixty-four million, seventy thousand, eight hundred ninety-three".