192977881661849 has 2 divisors, whose sum is σ = 192977881661850. Its totient is φ = 192977881661848.

The previous prime is 192977881661843. The next prime is 192977881661863. The reversal of 192977881661849 is 948166188779291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192977745239449 + 136422400 = 13891643^2 + 11680^2 .

It is an emirp because it is prime and its reverse (948166188779291) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-192977881661849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (192977881661843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96488940830924 + 96488940830925.

It is an arithmetic number, because the mean of its divisors is an integer number (96488940830925).

Almost surely, 2^{192977881661849} is an apocalyptic number.

It is an amenable number.

192977881661849 is a deficient number, since it is larger than the sum of its proper divisors (1).

192977881661849 is an equidigital number, since it uses as much as digits as its factorization.

192977881661849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5267275776, while the sum is 86.

The spelling of 192977881661849 in words is "one hundred ninety-two trillion, nine hundred seventy-seven billion, eight hundred eighty-one million, six hundred sixty-one thousand, eight hundred forty-nine".