66544859 has 8 divisors (see below), whose sum is σ = 70134480. Its totient is φ = 62964000.

The previous prime is 66544847. The next prime is 66544867. The reversal of 66544859 is 95844566.

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 66544859 - 2⁴ = 66544843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66544459) 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, 18509 + ... + 21809.

It is an arithmetic number, because the mean of its divisors is an integer number (8766810).

Almost surely, 2^66544859 is an apocalyptic number.

66544859 is a deficient number, since it is larger than the sum of its proper divisors (3589621).

66544859 is a wasteful number, since it uses less digits than its factorization.

66544859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381.

The product of its digits is 1036800, while the sum is 47.

The square root of 66544859 is about 8157.5032332203. The cubic root of 66544859 is about 405.2330295371.

The spelling of 66544859 in words is "sixty-six million, five hundred forty-four thousand, eight hundred fifty-nine".