189511868477 has 2 divisors, whose sum is σ = 189511868478. Its totient is φ = 189511868476.

The previous prime is 189511868407. The next prime is 189511868479. The reversal of 189511868477 is 774868115981.

189511868477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172379414596 + 17132453881 = 415186^2 + 130891^2 .

It is a cyclic number.

It is not a de Polignac number, because 189511868477 - 2¹⁶ = 189511802941 is a prime.

Together with 189511868479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189511868479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94755934238 + 94755934239.

It is an arithmetic number, because the mean of its divisors is an integer number (94755934239).

Almost surely, 2^189511868477 is an apocalyptic number.

It is an amenable number.

189511868477 is a deficient number, since it is larger than the sum of its proper divisors (1).

189511868477 is an equidigital number, since it uses as much as digits as its factorization.

189511868477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27095040, while the sum is 65.

The spelling of 189511868477 in words is "one hundred eighty-nine billion, five hundred eleven million, eight hundred sixty-eight thousand, four hundred seventy-seven".