181671693975089 has 2 divisors, whose sum is σ = 181671693975090. Its totient is φ = 181671693975088.

The previous prime is 181671693975053. The next prime is 181671693975137. The reversal of 181671693975089 is 980579396176181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117379521277489 + 64292172697600 = 10834183^2 + 8018240^2 .

It is an emirp because it is prime and its reverse (980579396176181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181671693975089 is a prime.

It is not a weakly prime, because it can be changed into another prime (181671693972089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90835846987544 + 90835846987545.

It is an arithmetic number, because the mean of its divisors is an integer number (90835846987545).

Almost surely, 2^{181671693975089} is an apocalyptic number.

It is an amenable number.

181671693975089 is a deficient number, since it is larger than the sum of its proper divisors (1).

181671693975089 is an equidigital number, since it uses as much as digits as its factorization.

181671693975089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1234517760, while the sum is 80.

The spelling of 181671693975089 in words is "one hundred eighty-one trillion, six hundred seventy-one billion, six hundred ninety-three million, nine hundred seventy-five thousand, eighty-nine".