66442859 has 8 divisors (see below), whose sum is σ = 76075488. Its totient is φ = 56845440.

The previous prime is 66442853. The next prime is 66442891. The reversal of 66442859 is 95824466.

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

It is a cyclic number.

It is not a de Polignac number, because 66442859 - 2⁴ = 66442843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66442853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4622 + ... + 12419.

It is an arithmetic number, because the mean of its divisors is an integer number (9509436).

Almost surely, 2^66442859 is an apocalyptic number.

66442859 is a deficient number, since it is larger than the sum of its proper divisors (9632629).

66442859 is a wasteful number, since it uses less digits than its factorization.

66442859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17605.

The product of its digits is 414720, while the sum is 44.

The square root of 66442859 is about 8151.2489227112. The cubic root of 66442859 is about 405.0258765156.

The spelling of 66442859 in words is "sixty-six million, four hundred forty-two thousand, eight hundred fifty-nine".