180749971609 has 3 divisors (see below), whose sum is σ = 180750396757. Its totient is φ = 180749546462.

The previous prime is 180749971601. The next prime is 180749971627. The reversal of 180749971609 is 906179947081.

The square root of 180749971609 is 425147.

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 is not a de Polignac number, because 180749971609 - 2³ = 180749971601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180749971601) 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, 212574 + ... + 637720.

Almost surely, 2^180749971609 is an apocalyptic number.

180749971609 is the 425147-th square number.

180749971609 is the 212574-th centered octagonal number.

It is an amenable number.

180749971609 is a deficient number, since it is larger than the sum of its proper divisors (425148).

180749971609 is an frugal number, since it uses more digits than its factorization.

180749971609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850294 (or 425147 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 61.

The spelling of 180749971609 in words is "one hundred eighty billion, seven hundred forty-nine million, nine hundred seventy-one thousand, six hundred nine".