66861222 has 16 divisors (see below), whose sum is σ = 133991280. Its totient is φ = 22242272.

The previous prime is 66861199. The next prime is 66861229. The reversal of 66861222 is 22216866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66861229) 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, 7893 + ... + 14000.

It is an arithmetic number, because the mean of its divisors is an integer number (8374455).

Almost surely, 2^66861222 is an apocalyptic number.

66861222 is an abundant number, since it is smaller than the sum of its proper divisors (67130058).

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

66861222 is a wasteful number, since it uses less digits than its factorization.

66861222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22407.

The product of its digits is 13824, while the sum is 33.

The square root of 66861222 is about 8176.8711620032. The cubic root of 66861222 is about 405.8741915677.

The spelling of 66861222 in words is "sixty-six million, eight hundred sixty-one thousand, two hundred twenty-two".