664364473 has 2 divisors, whose sum is σ = 664364474. Its totient is φ = 664364472.

The previous prime is 664364423. The next prime is 664364501. The reversal of 664364473 is 374463466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636401529 + 27962944 = 25227^2 + 5288^2 .

It is a cyclic number.

It is not a de Polignac number, because 664364473 - 2²¹ = 662267321 is a prime.

It is not a weakly prime, because it can be changed into another prime (664364413) 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, 332182236 + 332182237.

It is an arithmetic number, because the mean of its divisors is an integer number (332182237).

Almost surely, 2^664364473 is an apocalyptic number.

It is an amenable number.

664364473 is a deficient number, since it is larger than the sum of its proper divisors (1).

664364473 is an equidigital number, since it uses as much as digits as its factorization.

664364473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 43.

The square root of 664364473 is about 25775.2686309959. The cubic root of 664364473 is about 872.5737292889.

The spelling of 664364473 in words is "six hundred sixty-four million, three hundred sixty-four thousand, four hundred seventy-three".