66746443 has 4 divisors (see below), whose sum is σ = 66855240. Its totient is φ = 66637648.

The previous prime is 66746423. The next prime is 66746447. The reversal of 66746443 is 34464766.

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 66746443 - 2¹⁷ = 66615371 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66746396 and 66746405.

It is not an unprimeable number, because it can be changed into a prime (66746447) 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, 53473 + ... + 54706.

It is an arithmetic number, because the mean of its divisors is an integer number (16713810).

Almost surely, 2^66746443 is an apocalyptic number.

66746443 is a deficient number, since it is larger than the sum of its proper divisors (108797).

66746443 is a wasteful number, since it uses less digits than its factorization.

66746443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108796.

The product of its digits is 290304, while the sum is 40.

The square root of 66746443 is about 8169.8496314192. The cubic root of 66746443 is about 405.6418071578.

The spelling of 66746443 in words is "sixty-six million, seven hundred forty-six thousand, four hundred forty-three".