666202645 has 16 divisors (see below), whose sum is σ = 847188720. Its totient is φ = 502028800.

The previous prime is 666202639. The next prime is 666202697. The reversal of 666202645 is 546202666.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6380676 + 659821969 = 2526^2 + 25687^2 .

It is not a de Polignac number, because 666202645 - 2³ = 666202637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50086 + ... + 61975.

It is an arithmetic number, because the mean of its divisors is an integer number (52949295).

Almost surely, 2^666202645 is an apocalyptic number.

It is an amenable number.

666202645 is a deficient number, since it is larger than the sum of its proper divisors (180986075).

666202645 is a wasteful number, since it uses less digits than its factorization.

666202645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112136.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 666202645 is about 25810.9016696434. The cubic root of 666202645 is about 873.3777375625.

The spelling of 666202645 in words is "six hundred sixty-six million, two hundred two thousand, six hundred forty-five".