664421348 has 6 divisors (see below), whose sum is σ = 1162737366. Its totient is φ = 332210672.

The previous prime is 664421327. The next prime is 664421369. The reversal of 664421348 is 843124466.

664421348 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (664421327) and next prime (664421369).

It can be written as a sum of positive squares in only one way, i.e., 407716864 + 256704484 = 20192^2 + 16022^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83052665 + ... + 83052672.

It is an arithmetic number, because the mean of its divisors is an integer number (193789561).

Almost surely, 2^664421348 is an apocalyptic number.

It is an amenable number.

664421348 is a deficient number, since it is larger than the sum of its proper divisors (498316018).

664421348 is a wasteful number, since it uses less digits than its factorization.

664421348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166105341 (or 166105339 counting only the distinct ones).

The product of its digits is 110592, while the sum is 38.

The square root of 664421348 is about 25776.3718936549. The cubic root of 664421348 is about 872.5986283800.

The spelling of 664421348 in words is "six hundred sixty-four million, four hundred twenty-one thousand, three hundred forty-eight".