66666798 has 48 divisors (see below), whose sum is σ = 159073200. Its totient is φ = 20010240.

The previous prime is 66666793. The next prime is 66666827. The reversal of 66666798 is 89766666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666793) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20038 + ... + 23126.

It is an arithmetic number, because the mean of its divisors is an integer number (3314025).

Almost surely, 2^66666798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66666798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79536600).

66666798 is an abundant number, since it is smaller than the sum of its proper divisors (92406402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66666798 is a wasteful number, since it uses less digits than its factorization.

66666798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217 (or 3214 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 66666798 is about 8164.9738517646. The cubic root of 66666798 is about 405.4803993033.

The spelling of 66666798 in words is "sixty-six million, six hundred sixty-six thousand, seven hundred ninety-eight".