66281889 has 8 divisors (see below), whose sum is σ = 88421760. Its totient is φ = 44164976.

The previous prime is 66281879. The next prime is 66281893. The reversal of 66281889 is 98818266.

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 66281889 - 2⁵ = 66281857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66281879) 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, 2827 + ... + 11855.

It is an arithmetic number, because the mean of its divisors is an integer number (11052720).

Almost surely, 2^66281889 is an apocalyptic number.

It is an amenable number.

66281889 is a deficient number, since it is larger than the sum of its proper divisors (22139871).

66281889 is a wasteful number, since it uses less digits than its factorization.

66281889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11479.

The product of its digits is 331776, while the sum is 48.

The square root of 66281889 is about 8141.3689880757. The cubic root of 66281889 is about 404.6985288875.

The spelling of 66281889 in words is "sixty-six million, two hundred eighty-one thousand, eight hundred eighty-nine".