180081966661 has 2 divisors, whose sum is σ = 180081966662. Its totient is φ = 180081966660.

The previous prime is 180081966599. The next prime is 180081966677. The reversal of 180081966661 is 166669180081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171660233761 + 8421732900 = 414319^2 + 91770^2 .

It is an emirp because it is prime and its reverse (166669180081) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 199996180081 and 180081699991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180081966661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 180081966599 and 180081966608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180081960661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90040983330 + 90040983331.

It is an arithmetic number, because the mean of its divisors is an integer number (90040983331).

Almost surely, 2^180081966661 is an apocalyptic number.

It is an amenable number.

180081966661 is a deficient number, since it is larger than the sum of its proper divisors (1).

180081966661 is an equidigital number, since it uses as much as digits as its factorization.

180081966661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 180081966661 in words is "one hundred eighty billion, eighty-one million, nine hundred sixty-six thousand, six hundred sixty-one".