664173386 has 8 divisors (see below), whose sum is σ = 1048694880. Its totient is φ = 314608428.

The previous prime is 664173379. The next prime is 664173407. The reversal of 664173386 is 683371466.

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

It is a super-2 number, since 2×664173386² = 882252573341409992, which contains 22 as substring.

It is an unprimeable number.

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, 8739086 + ... + 8739161.

It is an arithmetic number, because the mean of its divisors is an integer number (131086860).

Almost surely, 2^664173386 is an apocalyptic number.

664173386 is a deficient number, since it is larger than the sum of its proper divisors (384521494).

664173386 is a wasteful number, since it uses less digits than its factorization.

664173386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17478268.

The product of its digits is 435456, while the sum is 44.

The square root of 664173386 is about 25771.5615747281. The cubic root of 664173386 is about 872.4900636247.

The spelling of 664173386 in words is "six hundred sixty-four million, one hundred seventy-three thousand, three hundred eighty-six".