66668364 has 72 divisors (see below), whose sum is σ = 195799968. Its totient is φ = 18731520.

The previous prime is 66668363. The next prime is 66668429. The reversal of 66668364 is 46386666.

It is not an unprimeable number, because it can be changed into a prime (66668363) 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, 13204 + ... + 17540.

It is an arithmetic number, because the mean of its divisors is an integer number (2719444).

Almost surely, 2^66668364 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66668364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97899984).

66668364 is an abundant number, since it is smaller than the sum of its proper divisors (129131604).

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

66668364 is a wasteful number, since it uses less digits than its factorization.

66668364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415 (or 4410 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 66668364 is about 8165.0697486304. The cubic root of 66668364 is about 405.4835741838.

The spelling of 66668364 in words is "sixty-six million, six hundred sixty-eight thousand, three hundred sixty-four".