664646354 has 8 divisors (see below), whose sum is σ = 998127360. Its totient is φ = 331937236.

The previous prime is 664646351. The next prime is 664646363. The reversal of 664646354 is 453646466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664646351) 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 in 3 ways as a sum of consecutive naturals, for example, 190814 + ... + 194265.

It is an arithmetic number, because the mean of its divisors is an integer number (124765920).

Almost surely, 2^664646354 is an apocalyptic number.

664646354 is a deficient number, since it is larger than the sum of its proper divisors (333481006).

664646354 is a wasteful number, since it uses less digits than its factorization.

664646354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385944.

The product of its digits is 1244160, while the sum is 44.

The square root of 664646354 is about 25780.7361027570. The cubic root of 664646354 is about 872.6971189780.

The spelling of 664646354 in words is "six hundred sixty-four million, six hundred forty-six thousand, three hundred fifty-four".