666229684 has 12 divisors (see below), whose sum is σ = 1216593504. Its totient is φ = 318631544.

The previous prime is 666229637. The next prime is 666229717. The reversal of 666229684 is 486922666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 3620722 + ... + 3620905.

It is an arithmetic number, because the mean of its divisors is an integer number (101382792).

Almost surely, 2^666229684 is an apocalyptic number.

It is an amenable number.

666229684 is a deficient number, since it is larger than the sum of its proper divisors (550363820).

666229684 is a wasteful number, since it uses less digits than its factorization.

666229684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7241654 (or 7241652 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 49.

The square root of 666229684 is about 25811.4254546315. The cubic root of 666229684 is about 873.3895532572.

The spelling of 666229684 in words is "six hundred sixty-six million, two hundred twenty-nine thousand, six hundred eighty-four".