666194052 has 12 divisors (see below), whose sum is σ = 1554452816. Its totient is φ = 222064680.

The previous prime is 666194021. The next prime is 666194063. The reversal of 666194052 is 250491666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 666194052.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27758074 + ... + 27758097.

Almost surely, 2^666194052 is an apocalyptic number.

It is an amenable number.

666194052 is an abundant number, since it is smaller than the sum of its proper divisors (888258764).

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

666194052 is a wasteful number, since it uses less digits than its factorization.

666194052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55516178 (or 55516176 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 666194052 is about 25810.7352084360. The cubic root of 666194052 is about 873.3739824653.

The spelling of 666194052 in words is "six hundred sixty-six million, one hundred ninety-four thousand, fifty-two".