18670172201 has 2 divisors, whose sum is σ = 18670172202. Its totient is φ = 18670172200.

The previous prime is 18670172177. The next prime is 18670172203. The reversal of 18670172201 is 10227107681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12701064601 + 5969107600 = 112699^2 + 77260^2 .

It is a cyclic number.

It is not a de Polignac number, because 18670172201 - 2¹⁴ = 18670155817 is a prime.

Together with 18670172203, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18670172203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9335086100 + 9335086101.

It is an arithmetic number, because the mean of its divisors is an integer number (9335086101).

Almost surely, 2^18670172201 is an apocalyptic number.

It is an amenable number.

18670172201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18670172201 is an equidigital number, since it uses as much as digits as its factorization.

18670172201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 35.

Adding to 18670172201 its reverse (10227107681), we get a palindrome (28897279882).

The spelling of 18670172201 in words is "eighteen billion, six hundred seventy million, one hundred seventy-two thousand, two hundred one".