189765797777 has 2 divisors, whose sum is σ = 189765797778. Its totient is φ = 189765797776.

The previous prime is 189765797747. The next prime is 189765797801. The reversal of 189765797777 is 777797567981.

189765797777 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., 187739357521 + 2026440256 = 433289^2 + 45016^2 .

It is a cyclic number.

It is not a de Polignac number, because 189765797777 - 2²⁶ = 189698688913 is a prime.

It is a super-2 number, since 2×189765797777² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (189765797747) 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, 94882898888 + 94882898889.

It is an arithmetic number, because the mean of its divisors is an integer number (94882898889).

Almost surely, 2^189765797777 is an apocalyptic number.

It is an amenable number.

189765797777 is a deficient number, since it is larger than the sum of its proper divisors (1).

189765797777 is an equidigital number, since it uses as much as digits as its factorization.

189765797777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2287096560, while the sum is 80.

The spelling of 189765797777 in words is "one hundred eighty-nine billion, seven hundred sixty-five million, seven hundred ninety-seven thousand, seven hundred seventy-seven".