664416494 has 20 divisors (see below), whose sum is σ = 1152889944. Its totient is φ = 281319204.

The previous prime is 664416451. The next prime is 664416497. The reversal of 664416494 is 494614466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664416497) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8004977 + ... + 8005059.

Almost surely, 2^664416494 is an apocalyptic number.

664416494 is a deficient number, since it is larger than the sum of its proper divisors (488473450).

664416494 is an frugal number, since it uses more digits than its factorization.

664416494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 92 counting only the distinct ones).

The product of its digits is 497664, while the sum is 44.

The square root of 664416494 is about 25776.2777374857. The cubic root of 664416494 is about 872.5965034212.

The spelling of 664416494 in words is "six hundred sixty-four million, four hundred sixteen thousand, four hundred ninety-four".