66013443 has 6 divisors (see below), whose sum is σ = 95352764. Its totient is φ = 44008956.

The previous prime is 66013417. The next prime is 66013481. The reversal of 66013443 is 34431066.

It is not a de Polignac number, because 66013443 - 2⁵ = 66013411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66011443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3667405 + ... + 3667422.

Almost surely, 2^66013443 is an apocalyptic number.

66013443 is a deficient number, since it is larger than the sum of its proper divisors (29339321).

66013443 is a wasteful number, since it uses less digits than its factorization.

66013443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7334833 (or 7334830 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 66013443 is about 8124.8657219673. The cubic root of 66013443 is about 404.1514377701.

The spelling of 66013443 in words is "sixty-six million, thirteen thousand, four hundred forty-three".