66166987222 has 12 divisors (see below), whose sum is σ = 115454641140. Its totient is φ = 28357280196.

The previous prime is 66166987219. The next prime is 66166987253. The reversal of 66166987222 is 22278966166.

It is a super-2 number, since 2×66166987222² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 337586572 + ... + 337586767.

It is an arithmetic number, because the mean of its divisors is an integer number (9621220095).

Almost surely, 2^66166987222 is an apocalyptic number.

66166987222 is a deficient number, since it is larger than the sum of its proper divisors (49287653918).

66166987222 is a wasteful number, since it uses less digits than its factorization.

66166987222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675173355 (or 675173348 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The spelling of 66166987222 in words is "sixty-six billion, one hundred sixty-six million, nine hundred eighty-seven thousand, two hundred twenty-two".