180666641 has 2 divisors, whose sum is σ = 180666642. Its totient is φ = 180666640.

The previous prime is 180666617. The next prime is 180666643. The reversal of 180666641 is 146666081.

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., 172134400 + 8532241 = 13120^2 + 2921^2 .

It is an emirp because it is prime and its reverse (146666081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180666641 is a prime.

Together with 180666643, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 180666595 and 180666604.

It is not a weakly prime, because it can be changed into another prime (180666643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90333320 + 90333321.

It is an arithmetic number, because the mean of its divisors is an integer number (90333321).

Almost surely, 2^180666641 is an apocalyptic number.

It is an amenable number.

180666641 is a deficient number, since it is larger than the sum of its proper divisors (1).

180666641 is an equidigital number, since it uses as much as digits as its factorization.

180666641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 180666641 is about 13441.2291476635. The cubic root of 180666641 is about 565.3177954767.

The spelling of 180666641 in words is "one hundred eighty million, six hundred sixty-six thousand, six hundred forty-one".