6666210252 has 72 divisors (see below), whose sum is σ = 18819048976. Its totient is φ = 2051137728.

The previous prime is 6666210247. The next prime is 6666210259. The reversal of 6666210252 is 2520126666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (6666210259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251143 + ... + 276414.

Almost surely, 2^6666210252 is an apocalyptic number.

It is an amenable number.

6666210252 is an abundant number, since it is smaller than the sum of its proper divisors (12152838724).

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

6666210252 is a wasteful number, since it uses less digits than its factorization.

6666210252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527589 (or 527575 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 6666210252 is about 81646.8630873226. The cubic root of 6666210252 is about 1882.0291065173.

The spelling of 6666210252 in words is "six billion, six hundred sixty-six million, two hundred ten thousand, two hundred fifty-two".