180420262707721 has 3 divisors (see below), whose sum is σ = 180420276139783. Its totient is φ = 180420249275660.

The previous prime is 180420262707649. The next prime is 180420262707761. The reversal of 180420262707721 is 127707262024081.

The square root of 180420262707721 is 13432061.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 174581757017721 + 5838505690000 = 13212939^2 + 2416300^2 .

It is not a de Polignac number, because 180420262707721 - 2²³ = 180420254319113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180420262707761) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6716031 + ... + 20148091.

Almost surely, 2^{180420262707721} is an apocalyptic number.

180420262707721 is the 13432061-st square number.

180420262707721 is the 6716031-st centered octagonal number.

It is an amenable number.

180420262707721 is a deficient number, since it is larger than the sum of its proper divisors (13432062).

180420262707721 is an frugal number, since it uses more digits than its factorization.

180420262707721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26864122 (or 13432061 counting only the distinct ones).

The product of its (nonzero) digits is 1053696, while the sum is 49.

The spelling of 180420262707721 in words is "one hundred eighty trillion, four hundred twenty billion, two hundred sixty-two million, seven hundred seven thousand, seven hundred twenty-one".