180632507981 has 2 divisors, whose sum is σ = 180632507982. Its totient is φ = 180632507980.

The previous prime is 180632507977. The next prime is 180632507983. The reversal of 180632507981 is 189705236081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180426154756 + 206353225 = 424766^2 + 14365^2 .

It is a cyclic number.

It is not a de Polignac number, because 180632507981 - 2² = 180632507977 is a prime.

It is a super-2 number, since 2×180632507981² (a number of 23 digits) contains 22 as substring.

Together with 180632507983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180632507983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90316253990 + 90316253991.

It is an arithmetic number, because the mean of its divisors is an integer number (90316253991).

Almost surely, 2^180632507981 is an apocalyptic number.

It is an amenable number.

180632507981 is a deficient number, since it is larger than the sum of its proper divisors (1).

180632507981 is an equidigital number, since it uses as much as digits as its factorization.

180632507981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 180632507981 in words is "one hundred eighty billion, six hundred thirty-two million, five hundred seven thousand, nine hundred eighty-one".