664173814 has 8 divisors (see below), whose sum is σ = 1011130488. Its totient is φ = 327130320.

The previous prime is 664173787. The next prime is 664173857. The reversal of 664173814 is 418371466.

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

It is a super-2 number, since 2×664173814² = 882253710406613192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2478127 + ... + 2478394.

It is an arithmetic number, because the mean of its divisors is an integer number (126391311).

Almost surely, 2^664173814 is an apocalyptic number.

664173814 is a deficient number, since it is larger than the sum of its proper divisors (346956674).

664173814 is a wasteful number, since it uses less digits than its factorization.

664173814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4956590.

The product of its digits is 96768, while the sum is 40.

The square root of 664173814 is about 25771.5698784533. The cubic root of 664173814 is about 872.4902510384.

The spelling of 664173814 in words is "six hundred sixty-four million, one hundred seventy-three thousand, eight hundred fourteen".