221666664146 has 48 divisors (see below), whose sum is σ = 383808728160. Its totient is φ = 95415586560.

The previous prime is 221666664137. The next prime is 221666664179. The reversal of 221666664146 is 641466666122.

It is a super-2 number, since 2×221666664146² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221666664094 and 221666664103.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 339281 + ... + 747291.

It is an arithmetic number, because the mean of its divisors is an integer number (7996015170).

Almost surely, 2^221666664146 is an apocalyptic number.

221666664146 is a deficient number, since it is larger than the sum of its proper divisors (162142064014).

221666664146 is a wasteful number, since it uses less digits than its factorization.

221666664146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408107 (or 408078 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 50.

The spelling of 221666664146 in words is "two hundred twenty-one billion, six hundred sixty-six million, six hundred sixty-four thousand, one hundred forty-six".