66972222 has 24 divisors (see below), whose sum is σ = 146086200. Its totient is φ = 22173360.

The previous prime is 66972221. The next prime is 66972239. The reversal of 66972222 is 22227966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66972221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9804 + ... + 15167.

It is an arithmetic number, because the mean of its divisors is an integer number (6086925).

Almost surely, 2^66972222 is an apocalyptic number.

66972222 is an abundant number, since it is smaller than the sum of its proper divisors (79113978).

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

66972222 is a wasteful number, since it uses less digits than its factorization.

66972222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25128 (or 25125 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 66972222 is about 8183.6557845501. The cubic root of 66972222 is about 406.0986720950.

The spelling of 66972222 in words is "sixty-six million, nine hundred seventy-two thousand, two hundred twenty-two".