66443447 has 8 divisors (see below), whose sum is σ = 78385152. Its totient is φ = 55114200.

The previous prime is 66443441. The next prime is 66443449. The reversal of 66443447 is 74434466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66443447 - 2²⁰ = 65394871 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 66443447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66443441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152879 + ... + 153312.

It is an arithmetic number, because the mean of its divisors is an integer number (9798144).

Almost surely, 2^66443447 is an apocalyptic number.

66443447 is a deficient number, since it is larger than the sum of its proper divisors (11941705).

66443447 is a wasteful number, since it uses less digits than its factorization.

66443447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306229.

The product of its digits is 193536, while the sum is 38.

The square root of 66443447 is about 8151.2849907239. The cubic root of 66443447 is about 405.0270712992.

The spelling of 66443447 in words is "sixty-six million, four hundred forty-three thousand, four hundred forty-seven".