66352645 has 4 divisors (see below), whose sum is σ = 79623180. Its totient is φ = 53082112.

The previous prime is 66352633. The next prime is 66352651. The reversal of 66352645 is 54625366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47141956 + 19210689 = 6866^2 + 4383^2 .

It is a cyclic number.

It is not a de Polignac number, because 66352645 - 2¹¹ = 66350597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6635260 + ... + 6635269.

It is an arithmetic number, because the mean of its divisors is an integer number (19905795).

Almost surely, 2^66352645 is an apocalyptic number.

It is an amenable number.

66352645 is a deficient number, since it is larger than the sum of its proper divisors (13270535).

66352645 is a wasteful number, since it uses less digits than its factorization.

66352645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13270534.

The product of its digits is 129600, while the sum is 37.

The square root of 66352645 is about 8145.7132898231. The cubic root of 66352645 is about 404.8424830724.

The spelling of 66352645 in words is "sixty-six million, three hundred fifty-two thousand, six hundred forty-five".