66673698 has 64 divisors (see below), whose sum is σ = 172784640. Its totient is φ = 16656192.

The previous prime is 66673687. The next prime is 66673723. The reversal of 66673698 is 89637666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66673698.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7161 + ... + 13587.

It is an arithmetic number, because the mean of its divisors is an integer number (2699760).

Almost surely, 2^66673698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66673698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86392320).

66673698 is an abundant number, since it is smaller than the sum of its proper divisors (106110942).

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

66673698 is a wasteful number, since it uses less digits than its factorization.

66673698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6471.

The product of its digits is 1959552, while the sum is 51.

The square root of 66673698 is about 8165.3963773965. The cubic root of 66673698 is about 405.4943878670.

The spelling of 66673698 in words is "sixty-six million, six hundred seventy-three thousand, six hundred ninety-eight".