205489152646871 has 2 divisors, whose sum is σ = 205489152646872. Its totient is φ = 205489152646870.

The previous prime is 205489152646819. The next prime is 205489152646901. The reversal of 205489152646871 is 178646251984502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205489152646871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205489452646871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102744576323435 + 102744576323436.

It is an arithmetic number, because the mean of its divisors is an integer number (102744576323436).

Almost surely, 2^{205489152646871} is an apocalyptic number.

205489152646871 is a deficient number, since it is larger than the sum of its proper divisors (1).

205489152646871 is an equidigital number, since it uses as much as digits as its factorization.

205489152646871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 232243200, while the sum is 68.

The spelling of 205489152646871 in words is "two hundred five trillion, four hundred eighty-nine billion, one hundred fifty-two million, six hundred forty-six thousand, eight hundred seventy-one".