180843228521 has 16 divisors (see below), whose sum is σ = 190940898240. Its totient is φ = 170804335680.

The previous prime is 180843228499. The next prime is 180843228539. The reversal of 180843228521 is 125822348081.

It is a cyclic number.

It is not a de Polignac number, because 180843228521 - 2¹⁰ = 180843227497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (180843228121) 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, 8463311 + ... + 8484651.

It is an arithmetic number, because the mean of its divisors is an integer number (11933806140).

Almost surely, 2^180843228521 is an apocalyptic number.

It is an amenable number.

180843228521 is a deficient number, since it is larger than the sum of its proper divisors (10097669719).

180843228521 is a wasteful number, since it uses less digits than its factorization.

180843228521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22696.

The product of its (nonzero) digits is 245760, while the sum is 44.

The spelling of 180843228521 in words is "one hundred eighty billion, eight hundred forty-three million, two hundred twenty-eight thousand, five hundred twenty-one".