66447849 has 64 divisors (see below), whose sum is σ = 107993088. Its totient is φ = 35942400.

The previous prime is 66447833. The next prime is 66447859. The reversal of 66447849 is 94874466.

It is not a de Polignac number, because 66447849 - 2⁴ = 66447833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66447798 and 66447807.

It is not an unprimeable number, because it can be changed into a prime (66447859) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1089279 + ... + 1089339.

It is an arithmetic number, because the mean of its divisors is an integer number (1687392).

Almost surely, 2^66447849 is an apocalyptic number.

It is an amenable number.

66447849 is a deficient number, since it is larger than the sum of its proper divisors (41545239).

66447849 is a wasteful number, since it uses less digits than its factorization.

66447849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178.

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

The square root of 66447849 is about 8151.5550050282. Note that the first 3 decimals coincide. The cubic root of 66447849 is about 405.0360156967.

The spelling of 66447849 in words is "sixty-six million, four hundred forty-seven thousand, eight hundred forty-nine".