66068647 has 4 divisors (see below), whose sum is σ = 69955056. Its totient is φ = 62182240.

The previous prime is 66068623. The next prime is 66068659. The reversal of 66068647 is 74686066.

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

It is a cyclic number.

It is not a de Polignac number, because 66068647 - 2²³ = 57680039 is a prime.

It is a super-2 number, since 2×66068647² = 8730132232821218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66068617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1943179 + ... + 1943212.

It is an arithmetic number, because the mean of its divisors is an integer number (17488764).

Almost surely, 2^66068647 is an apocalyptic number.

66068647 is a deficient number, since it is larger than the sum of its proper divisors (3886409).

66068647 is a wasteful number, since it uses less digits than its factorization.

66068647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886408.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 66068647 is about 8128.2622374035. The cubic root of 66068647 is about 404.2640641216.

The spelling of 66068647 in words is "sixty-six million, sixty-eight thousand, six hundred forty-seven".