66449847 has 4 divisors (see below), whose sum is σ = 88599800. Its totient is φ = 44299896.

The previous prime is 66449837. The next prime is 66449879. The reversal of 66449847 is 74894466.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-66449847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66449796 and 66449805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66449827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11074972 + ... + 11074977.

It is an arithmetic number, because the mean of its divisors is an integer number (22149950).

Almost surely, 2^66449847 is an apocalyptic number.

66449847 is a deficient number, since it is larger than the sum of its proper divisors (22149953).

66449847 is a wasteful number, since it uses less digits than its factorization.

66449847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22149952.

The product of its digits is 1161216, while the sum is 48.

The square root of 66449847 is about 8151.6775574111. The cubic root of 66449847 is about 405.0400752906.

The spelling of 66449847 in words is "sixty-six million, four hundred forty-nine thousand, eight hundred forty-seven".