66449447 has 16 divisors (see below), whose sum is σ = 73133280. Its totient is φ = 60115968.

The previous prime is 66449437. The next prime is 66449497. The reversal of 66449447 is 74494466.

It is a cyclic number.

It is not a de Polignac number, because 66449447 - 2⁴ = 66449431 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 66449398 and 66449407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66449437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55388 + ... + 56574.

It is an arithmetic number, because the mean of its divisors is an integer number (4570830).

Almost surely, 2^66449447 is an apocalyptic number.

66449447 is a deficient number, since it is larger than the sum of its proper divisors (6683833).

66449447 is a wasteful number, since it uses less digits than its factorization.

66449447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330.

The product of its digits is 580608, while the sum is 44.

The square root of 66449447 is about 8151.6530225470. The cubic root of 66449447 is about 405.0392625656.

The spelling of 66449447 in words is "sixty-six million, four hundred forty-nine thousand, four hundred forty-seven".