180863928961 has 3 divisors (see below), whose sum is σ = 180864354243. Its totient is φ = 180863503680.

The previous prime is 180863928943. The next prime is 180863928977. The reversal of 180863928961 is 169829368081.

The square root of 180863928961 is 425281.

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., 157197183361 + 23666745600 = 396481^2 + 153840^2 .

It is not a de Polignac number, because 180863928961 - 2⁵ = 180863928929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 180863928961.

It is not an unprimeable number, because it can be changed into a prime (180863928361) 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, 212641 + ... + 637921.

It is an arithmetic number, because the mean of its divisors is an integer number (60288118081).

Almost surely, 2^180863928961 is an apocalyptic number.

180863928961 is the 425281-st square number.

180863928961 is the 212641-st centered octagonal number.

It is an amenable number.

180863928961 is a deficient number, since it is larger than the sum of its proper divisors (425282).

180863928961 is an frugal number, since it uses more digits than its factorization.

180863928961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850562 (or 425281 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 61.

The spelling of 180863928961 in words is "one hundred eighty billion, eight hundred sixty-three million, nine hundred twenty-eight thousand, nine hundred sixty-one".