66715386 has 16 divisors (see below), whose sum is σ = 134482944. Its totient is φ = 22063104.

The previous prime is 66715381. The next prime is 66715417. The reversal of 66715386 is 68351766.

It is not an unprimeable number, because it can be changed into a prime (66715381) 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, 43015 + ... + 44538.

It is an arithmetic number, because the mean of its divisors is an integer number (8405184).

Almost surely, 2^66715386 is an apocalyptic number.

66715386 is an abundant number, since it is smaller than the sum of its proper divisors (67767558).

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

66715386 is a wasteful number, since it uses less digits than its factorization.

66715386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87685.

The product of its digits is 181440, while the sum is 42.

The square root of 66715386 is about 8167.9487020916. The cubic root of 66715386 is about 405.5788825959.

The spelling of 66715386 in words is "sixty-six million, seven hundred fifteen thousand, three hundred eighty-six".