1985677133171 has 2 divisors, whose sum is σ = 1985677133172. Its totient is φ = 1985677133170.

The previous prime is 1985677133161. The next prime is 1985677133173. The reversal of 1985677133171 is 1713317765891.

It is a strong prime.

It is an emirp because it is prime and its reverse (1713317765891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1985677133171 - 2³⁴ = 1968497263987 is a prime.

Together with 1985677133173, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1985677133171.

It is not a weakly prime, because it can be changed into another prime (1985677133173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992838566585 + 992838566586.

It is an arithmetic number, because the mean of its divisors is an integer number (992838566586).

Almost surely, 2^{1985677133171} is an apocalyptic number.

1985677133171 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985677133171 is an equidigital number, since it uses as much as digits as its factorization.

1985677133171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6667920, while the sum is 59.

The spelling of 1985677133171 in words is "one trillion, nine hundred eighty-five billion, six hundred seventy-seven million, one hundred thirty-three thousand, one hundred seventy-one".