66165222 has 32 divisors (see below), whose sum is σ = 137723904. Its totient is φ = 21168000.

The previous prime is 66165217. The next prime is 66165223. The reversal of 66165222 is 22256166.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 66165222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66165223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22222 + ... + 25022.

It is an arithmetic number, because the mean of its divisors is an integer number (4303872).

Almost surely, 2^66165222 is an apocalyptic number.

66165222 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

66165222 is an abundant number, since it is smaller than the sum of its proper divisors (71558682).

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

66165222 is a wasteful number, since it uses less digits than its factorization.

66165222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2964.

The product of its digits is 8640, while the sum is 30.

The square root of 66165222 is about 8134.2007597551. The cubic root of 66165222 is about 404.4609441660.

The spelling of 66165222 in words is "sixty-six million, one hundred sixty-five thousand, two hundred twenty-two".