180891605345 has 12 divisors (see below), whose sum is σ = 238597523220. Its totient is φ = 131557530720.

The previous prime is 180891605329. The next prime is 180891605347. The reversal of 180891605345 is 543506198081.

It can be written as a sum of positive squares in 2 ways, for example, as 21442330624 + 159449274721 = 146432^2 + 399311^2 .

It is not a de Polignac number, because 180891605345 - 2⁴ = 180891605329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 180891605293 and 180891605302.

It is not an unprimeable number, because it can be changed into a prime (180891605347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149496590 + ... + 149497799.

It is an arithmetic number, because the mean of its divisors is an integer number (19883126935).

Almost surely, 2^180891605345 is an apocalyptic number.

It is an amenable number.

180891605345 is a deficient number, since it is larger than the sum of its proper divisors (57705917875).

180891605345 is a wasteful number, since it uses less digits than its factorization.

180891605345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298994416 (or 298994405 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 180891605345 in words is "one hundred eighty billion, eight hundred ninety-one million, six hundred five thousand, three hundred forty-five".