180464385721 has 3 divisors (see below), whose sum is σ = 180464810533. Its totient is φ = 180463960910.

The previous prime is 180464385713. The next prime is 180464385749. The reversal of 180464385721 is 127583464081.

The square root of 180464385721 is 424811.

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

180464385721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 127583464081 = 1187 ⋅107483963.

It is not a de Polignac number, because 180464385721 - 2³ = 180464385713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180464385781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 212406 + ... + 637216.

Almost surely, 2^180464385721 is an apocalyptic number.

180464385721 is the 424811-st square number.

180464385721 is the 212406-th centered octagonal number.

It is an amenable number.

180464385721 is a deficient number, since it is larger than the sum of its proper divisors (424812).

180464385721 is an frugal number, since it uses more digits than its factorization.

180464385721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849622 (or 424811 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

Multiplying 180464385721 by its sum of digits (49), we get a square (8842754900329 = 2973677²).

The spelling of 180464385721 in words is "one hundred eighty billion, four hundred sixty-four million, three hundred eighty-five thousand, seven hundred twenty-one".