66282647 has 4 divisors (see below), whose sum is σ = 66318120. Its totient is φ = 66247176.

The previous prime is 66282641. The next prime is 66282649. The reversal of 66282647 is 74628266.

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 66282647 - 2¹⁶ = 66217111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66282641) 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, 14768 + ... + 18725.

It is an arithmetic number, because the mean of its divisors is an integer number (16579530).

Almost surely, 2^66282647 is an apocalyptic number.

66282647 is a deficient number, since it is larger than the sum of its proper divisors (35473).

66282647 is a wasteful number, since it uses less digits than its factorization.

66282647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35472.

The product of its digits is 193536, while the sum is 41.

The square root of 66282647 is about 8141.4155403099. The cubic root of 66282647 is about 404.7000715931.

The spelling of 66282647 in words is "sixty-six million, two hundred eighty-two thousand, six hundred forty-seven".