664705414 has 4 divisors (see below), whose sum is σ = 997058124. Its totient is φ = 332352706.

The previous prime is 664705381. The next prime is 664705439. The reversal of 664705414 is 414507466.

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

It is a super-2 number, since 2×664705414² = 883666574801822792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166176352 + ... + 166176355.

It is an arithmetic number, because the mean of its divisors is an integer number (249264531).

Almost surely, 2^664705414 is an apocalyptic number.

664705414 is a deficient number, since it is larger than the sum of its proper divisors (332352710).

664705414 is a wasteful number, since it uses less digits than its factorization.

664705414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332352709.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 664705414 is about 25781.8815062051. The cubic root of 664705414 is about 872.7229672932.

The spelling of 664705414 in words is "six hundred sixty-four million, seven hundred five thousand, four hundred fourteen".