66439449 has 12 divisors (see below), whose sum is σ = 96353712. Its totient is φ = 44115000.

The previous prime is 66439441. The next prime is 66439453. The reversal of 66439449 is 94493466.

It is a happy number.

It is not a de Polignac number, because 66439449 - 2³ = 66439441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66439441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12447 + ... + 16964.

It is an arithmetic number, because the mean of its divisors is an integer number (8029476).

Almost surely, 2^66439449 is an apocalyptic number.

It is an amenable number.

66439449 is a deficient number, since it is larger than the sum of its proper divisors (29914263).

66439449 is a wasteful number, since it uses less digits than its factorization.

66439449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29668 (or 29665 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 66439449 is about 8151.0397496270. The cubic root of 66439449 is about 405.0189474446.

The spelling of 66439449 in words is "sixty-six million, four hundred thirty-nine thousand, four hundred forty-nine".