666902 has 4 divisors (see below), whose sum is σ = 1000356. Its totient is φ = 333450.

The previous prime is 666901. The next prime is 666929. The reversal of 666902 is 209666.

It is a happy number.

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 (666901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166724 + ... + 166727.

It is an arithmetic number, because the mean of its divisors is an integer number (250089).

2⁶⁶⁶⁹⁰² is an apocalyptic number.

666902 is a deficient number, since it is larger than the sum of its proper divisors (333454).

666902 is a wasteful number, since it uses less digits than its factorization.

666902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333453.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 666902 is about 816.6406798587. The cubic root of 666902 is about 87.3683243945.

The spelling of 666902 in words is "six hundred sixty-six thousand, nine hundred two".