66218334 has 64 divisors (see below), whose sum is σ = 170118144. Its totient is φ = 16701696.

The previous prime is 66218329. The next prime is 66218351. The reversal of 66218334 is 43381266.

It is a junction number, because it is equal to n+sod(n) for n = 66218295 and 66218304.

It is a congruent number.

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, 9922 + ... + 15194.

It is an arithmetic number, because the mean of its divisors is an integer number (2658096).

Almost surely, 2^66218334 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66218334, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85059072).

66218334 is an abundant number, since it is smaller than the sum of its proper divisors (103899810).

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

66218334 is a wasteful number, since it uses less digits than its factorization.

66218334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5321.

The product of its digits is 20736, while the sum is 33.

The square root of 66218334 is about 8137.4648386337. The cubic root of 66218334 is about 404.5691378850.

The spelling of 66218334 in words is "sixty-six million, two hundred eighteen thousand, three hundred thirty-four".