66602644 has 12 divisors (see below), whose sum is σ = 116929204. Its totient is φ = 33194304.

The previous prime is 66602639. The next prime is 66602659. The reversal of 66602644 is 44620666.

66602644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 17322244 + 49280400 = 4162^2 + 7020^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25347 + ... + 27850.

Almost surely, 2^66602644 is an apocalyptic number.

It is an amenable number.

66602644 is a deficient number, since it is larger than the sum of its proper divisors (50326560).

66602644 is a wasteful number, since it uses less digits than its factorization.

66602644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53514 (or 53512 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 66602644 is about 8161.0442959219. The cubic root of 66602644 is about 405.3502918685.

The spelling of 66602644 in words is "sixty-six million, six hundred two thousand, six hundred forty-four".