66718386 has 144 divisors (see below), whose sum is σ = 185889600. Its totient is φ = 16873920.

The previous prime is 66718373. The next prime is 66718397. The reversal of 66718386 is 68381766.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2152191 + ... + 2152221.

It is an arithmetic number, because the mean of its divisors is an integer number (1290900).

Almost surely, 2^66718386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66718386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92944800).

66718386 is an abundant number, since it is smaller than the sum of its proper divisors (119171214).

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

66718386 is a wasteful number, since it uses less digits than its factorization.

66718386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 91 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 66718386 is about 8168.1323446673. The cubic root of 66718386 is about 405.5849617453.

The spelling of 66718386 in words is "sixty-six million, seven hundred eighteen thousand, three hundred eighty-six".