66286643 has 4 divisors (see below), whose sum is σ = 66310608. Its totient is φ = 66262680.

The previous prime is 66286613. The next prime is 66286657. The reversal of 66286643 is 34668266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34668266 = 2 ⋅17334133.

It is a cyclic number.

It is not a de Polignac number, because 66286643 - 2⁶ = 66286579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66286643.

It is not an unprimeable number, because it can be changed into a prime (66286613) 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, 7196 + ... + 13577.

It is an arithmetic number, because the mean of its divisors is an integer number (16577652).

Almost surely, 2^66286643 is an apocalyptic number.

66286643 is a deficient number, since it is larger than the sum of its proper divisors (23965).

66286643 is a wasteful number, since it uses less digits than its factorization.

66286643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23964.

The product of its digits is 248832, while the sum is 41.

The square root of 66286643 is about 8141.6609484797. The cubic root of 66286643 is about 404.7082041841.

The spelling of 66286643 in words is "sixty-six million, two hundred eighty-six thousand, six hundred forty-three".