666204622 has 4 divisors (see below), whose sum is σ = 999306936. Its totient is φ = 333102310.

The previous prime is 666204611. The next prime is 666204629. The reversal of 666204622 is 226402666.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666204629) by changing a digit.

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 as a sum of consecutive naturals, namely, 166551154 + ... + 166551157.

It is an arithmetic number, because the mean of its divisors is an integer number (249826734).

Almost surely, 2^666204622 is an apocalyptic number.

666204622 is a deficient number, since it is larger than the sum of its proper divisors (333102314).

666204622 is a wasteful number, since it uses less digits than its factorization.

666204622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333102313.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 666204622 is about 25810.9399673859. The cubic root of 666204622 is about 873.3786014969.

The spelling of 666204622 in words is "six hundred sixty-six million, two hundred four thousand, six hundred twenty-two".