180664447221 has 32 divisors (see below), whose sum is σ = 271429079040. Its totient is φ = 118748775600.

The previous prime is 180664447213. The next prime is 180664447279. The reversal of 180664447221 is 122744466081.

180664447221 is a `hidden beast` number, since 1 + 80 + 66 + 44 + 472 + 2 + 1 = 666.

It is not a de Polignac number, because 180664447221 - 2³ = 180664447213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180664447721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1018236 + ... + 1182426.

It is an arithmetic number, because the mean of its divisors is an integer number (8482158720).

Almost surely, 2^180664447221 is an apocalyptic number.

It is an amenable number.

180664447221 is a deficient number, since it is larger than the sum of its proper divisors (90764631819).

180664447221 is a wasteful number, since it uses less digits than its factorization.

180664447221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164774 (or 164768 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 180664447221 in words is "one hundred eighty billion, six hundred sixty-four million, four hundred forty-seven thousand, two hundred twenty-one".