666035172 has 36 divisors (see below), whose sum is σ = 1836643536. Its totient is φ = 201828720.

The previous prime is 666035131. The next prime is 666035189. The reversal of 666035172 is 271530666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 840558 + ... + 841349.

It is an arithmetic number, because the mean of its divisors is an integer number (51017876).

Almost surely, 2^666035172 is an apocalyptic number.

It is an amenable number.

666035172 is an abundant number, since it is smaller than the sum of its proper divisors (1170608364).

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

666035172 is a wasteful number, since it uses less digits than its factorization.

666035172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681928 (or 1681923 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 666035172 is about 25807.6572357895. The cubic root of 666035172 is about 873.3045468954.

The spelling of 666035172 in words is "six hundred sixty-six million, thirty-five thousand, one hundred seventy-two".