66294643 has 4 divisors (see below), whose sum is σ = 66315808. Its totient is φ = 66273480.

The previous prime is 66294607. The next prime is 66294649. The reversal of 66294643 is 34649266.

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 66294643 - 2⁹ = 66294131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66294596 and 66294605.

It is not an unprimeable number, because it can be changed into a prime (66294649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4848 + ... + 12493.

It is an arithmetic number, because the mean of its divisors is an integer number (16578952).

Almost surely, 2^66294643 is an apocalyptic number.

66294643 is a deficient number, since it is larger than the sum of its proper divisors (21165).

66294643 is a wasteful number, since it uses less digits than its factorization.

66294643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21164.

The product of its digits is 186624, while the sum is 40.

The square root of 66294643 is about 8142.1522338998. The cubic root of 66294643 is about 404.7244846656.

The spelling of 66294643 in words is "sixty-six million, two hundred ninety-four thousand, six hundred forty-three".