666652 has 24 divisors (see below), whose sum is σ = 1380960. Its totient is φ = 275520.

The previous prime is 666649. The next prime is 666667. The reversal of 666652 is 256666.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 7 and base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402 + ... + 1222.

It is an arithmetic number, because the mean of its divisors is an integer number (57540).

2⁶⁶⁶⁶⁵² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (690480).

666652 is an abundant number, since it is smaller than the sum of its proper divisors (714308).

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

666652 is a wasteful number, since it uses less digits than its factorization.

666652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 859 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 666652 is about 816.4875994159. The cubic root of 666652 is about 87.3574058433.

The spelling of 666652 in words is "six hundred sixty-six thousand, six hundred fifty-two".