664173452 has 6 divisors (see below), whose sum is σ = 1162303548. Its totient is φ = 332086724.

The previous prime is 664173451. The next prime is 664173463. The reversal of 664173452 is 254371466.

It is a happy number.

It is a super-2 number, since 2×664173452² = 882252748683192608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664173451) by changing a digit.

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 as a sum of consecutive naturals, namely, 83021678 + ... + 83021685.

It is an arithmetic number, because the mean of its divisors is an integer number (193717258).

Almost surely, 2^664173452 is an apocalyptic number.

It is an amenable number.

664173452 is a deficient number, since it is larger than the sum of its proper divisors (498130096).

664173452 is a wasteful number, since it uses less digits than its factorization.

664173452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166043367 (or 166043365 counting only the distinct ones).

The product of its digits is 120960, while the sum is 38.

The square root of 664173452 is about 25771.5628552092. The cubic root of 664173452 is about 872.4900925249.

The spelling of 664173452 in words is "six hundred sixty-four million, one hundred seventy-three thousand, four hundred fifty-two".