180555020343221 has 16 divisors (see below), whose sum is σ = 192130619511600. Its totient is φ = 169371344486400.

The previous prime is 180555020343211. The next prime is 180555020343259. The reversal of 180555020343221 is 122343020555081.

It can be written as a sum of positive squares in 8 ways, for example, as 12653316122500 + 167901704220721 = 3557150^2 + 12957689^2 .

It is a cyclic number.

It is not a de Polignac number, because 180555020343221 - 2³⁰ = 180553946601397 is a prime.

It is a super-2 number, since 2×180555020343221² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180555020343211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314764316 + ... + 315337413.

It is an arithmetic number, because the mean of its divisors is an integer number (12008163719475).

Almost surely, 2^{180555020343221} is an apocalyptic number.

It is an amenable number.

180555020343221 is a deficient number, since it is larger than the sum of its proper divisors (11575599168379).

180555020343221 is a wasteful number, since it uses less digits than its factorization.

180555020343221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630102040.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 180555020343221 in words is "one hundred eighty trillion, five hundred fifty-five billion, twenty million, three hundred forty-three thousand, two hundred twenty-one".