71666220222 has 12 divisors (see below), whose sum is σ = 155276810520. Its totient is φ = 23888740068.

The previous prime is 71666220211. The next prime is 71666220229. The reversal of 71666220222 is 22202266617.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71666220229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1990728322 + ... + 1990728357.

It is an arithmetic number, because the mean of its divisors is an integer number (12939734210).

Almost surely, 2^71666220222 is an apocalyptic number.

71666220222 is an abundant number, since it is smaller than the sum of its proper divisors (83610590298).

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

71666220222 is a wasteful number, since it uses less digits than its factorization.

71666220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3981456687 (or 3981456684 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

Adding to 71666220222 its reverse (22202266617), we get a palindrome (93868486839).

The spelling of 71666220222 in words is "seventy-one billion, six hundred sixty-six million, two hundred twenty thousand, two hundred twenty-two".