66442899 has 8 divisors (see below), whose sum is σ = 89103312. Its totient is φ = 44038880.

The previous prime is 66442891. The next prime is 66442903. The reversal of 66442899 is 99824466.

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

It is not a de Polignac number, because 66442899 - 2³ = 66442891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66442891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63492 + ... + 64529.

It is an arithmetic number, because the mean of its divisors is an integer number (11137914).

Almost surely, 2^66442899 is an apocalyptic number.

66442899 is a deficient number, since it is larger than the sum of its proper divisors (22660413).

66442899 is a wasteful number, since it uses less digits than its factorization.

66442899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128197.

The product of its digits is 746496, while the sum is 48.

The square root of 66442899 is about 8151.2513763225. The cubic root of 66442899 is about 405.0259577936.

The spelling of 66442899 in words is "sixty-six million, four hundred forty-two thousand, eight hundred ninety-nine".