664633454 has 4 divisors (see below), whose sum is σ = 996950184. Its totient is φ = 332316726.

The previous prime is 664633451. The next prime is 664633469. The reversal of 664633454 is 454336466.

664633454 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664633451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166158362 + ... + 166158365.

It is an arithmetic number, because the mean of its divisors is an integer number (249237546).

Almost surely, 2^664633454 is an apocalyptic number.

664633454 is a deficient number, since it is larger than the sum of its proper divisors (332316730).

664633454 is a wasteful number, since it uses less digits than its factorization.

664633454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332316729.

The product of its digits is 622080, while the sum is 41.

The square root of 664633454 is about 25780.4859147379. The cubic root of 664633454 is about 872.6914729350.

The spelling of 664633454 in words is "six hundred sixty-four million, six hundred thirty-three thousand, four hundred fifty-four".