180723456991 has 32 divisors (see below), whose sum is σ = 229637846016. Its totient is φ = 138124896000.

The previous prime is 180723456971. The next prime is 180723457027. The reversal of 180723456991 is 199654327081.

It is a happy number.

It is not a de Polignac number, because 180723456991 - 2⁹ = 180723456479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180723456931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26608806 + ... + 26615596.

It is an arithmetic number, because the mean of its divisors is an integer number (7176182688).

It is a 1-persistent number, because it is pandigital, but 2⋅180723456991 = 361446913982 is not.

Almost surely, 2^180723456991 is an apocalyptic number.

180723456991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

180723456991 is a deficient number, since it is larger than the sum of its proper divisors (48914389025).

180723456991 is a wasteful number, since it uses less digits than its factorization.

180723456991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13383.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 180723456991 in words is "one hundred eighty billion, seven hundred twenty-three million, four hundred fifty-six thousand, nine hundred ninety-one".