18001970177 has 2 divisors, whose sum is σ = 18001970178. Its totient is φ = 18001970176.

The previous prime is 18001970153. The next prime is 18001970179. The reversal of 18001970177 is 77107910081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13228680256 + 4773289921 = 115016^2 + 69089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18001970177 is a prime.

It is a super-2 number, since 2×18001970177² (a number of 21 digits) contains 22 as substring.

Together with 18001970179, 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 (18001970179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000985088 + 9000985089.

It is an arithmetic number, because the mean of its divisors is an integer number (9000985089).

Almost surely, 2^18001970177 is an apocalyptic number.

It is an amenable number.

18001970177 is a deficient number, since it is larger than the sum of its proper divisors (1).

18001970177 is an equidigital number, since it uses as much as digits as its factorization.

18001970177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24696, while the sum is 41.

The spelling of 18001970177 in words is "eighteen billion, one million, nine hundred seventy thousand, one hundred seventy-seven".