664204194 has 24 divisors (see below), whose sum is σ = 1445089932. Its totient is φ = 220481280.

The previous prime is 664204193. The next prime is 664204199. The reversal of 664204194 is 491402466.

664204194 is a `hidden beast` number, since 6 + 642 + 0 + 4 + 1 + 9 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 643383225 + 20820969 = 25365^2 + 4563^2 .

It is a super-2 number, since 2×664204194² = 882334422654379272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664204193) 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 in 11 ways as a sum of consecutive naturals, for example, 72219 + ... + 80894.

Almost surely, 2^664204194 is an apocalyptic number.

664204194 is an abundant number, since it is smaller than the sum of its proper divisors (780885738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664204194 is a wasteful number, since it uses less digits than its factorization.

664204194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153362 (or 153359 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 664204194 is about 25772.1592808984. The cubic root of 664204194 is about 872.5035537057.

The spelling of 664204194 in words is "six hundred sixty-four million, two hundred four thousand, one hundred ninety-four".