664221346 has 4 divisors (see below), whose sum is σ = 996332022. Its totient is φ = 332110672.

The previous prime is 664221293. The next prime is 664221359. The reversal of 664221346 is 643122466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 639331225 + 24890121 = 25285^2 + 4989^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166055335 + ... + 166055338.

Almost surely, 2^664221346 is an apocalyptic number.

664221346 is a deficient number, since it is larger than the sum of its proper divisors (332110676).

664221346 is a wasteful number, since it uses less digits than its factorization.

664221346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332110675.

The product of its digits is 41472, while the sum is 34.

The square root of 664221346 is about 25772.4920409339. The cubic root of 664221346 is about 872.5110639725.

The spelling of 664221346 in words is "six hundred sixty-four million, two hundred twenty-one thousand, three hundred forty-six".