664196293 has 2 divisors, whose sum is σ = 664196294. Its totient is φ = 664196292.

The previous prime is 664196263. The next prime is 664196303. The reversal of 664196293 is 392691466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 431725284 + 232471009 = 20778^2 + 15247^2 .

It is a cyclic number.

It is not a de Polignac number, because 664196293 - 2⁵ = 664196261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664196263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332098146 + 332098147.

It is an arithmetic number, because the mean of its divisors is an integer number (332098147).

Almost surely, 2^664196293 is an apocalyptic number.

It is an amenable number.

664196293 is a deficient number, since it is larger than the sum of its proper divisors (1).

664196293 is an equidigital number, since it uses as much as digits as its factorization.

664196293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 46.

The square root of 664196293 is about 25772.0059948775. The cubic root of 664196293 is about 872.5000940879.

The spelling of 664196293 in words is "six hundred sixty-four million, one hundred ninety-six thousand, two hundred ninety-three".