180138680021 has 4 divisors (see below), whose sum is σ = 189619663200. Its totient is φ = 170657696844.

The previous prime is 180138680011. The next prime is 180138680087. The reversal of 180138680021 is 120086831081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 180138680021 - 2²⁶ = 180071571157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180138680011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4740491561 + ... + 4740491598.

It is an arithmetic number, because the mean of its divisors is an integer number (47404915800).

Almost surely, 2^180138680021 is an apocalyptic number.

It is an amenable number.

180138680021 is a deficient number, since it is larger than the sum of its proper divisors (9480983179).

180138680021 is an equidigital number, since it uses as much as digits as its factorization.

180138680021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9480983178.

The product of its (nonzero) digits is 18432, while the sum is 38.

The spelling of 180138680021 in words is "one hundred eighty billion, one hundred thirty-eight million, six hundred eighty thousand, twenty-one".