205311954871 has 2 divisors, whose sum is σ = 205311954872. Its totient is φ = 205311954870.

The previous prime is 205311954847. The next prime is 205311954893. The reversal of 205311954871 is 178459113502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205311954871 - 2⁵ = 205311954839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205311952871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102655977435 + 102655977436.

It is an arithmetic number, because the mean of its divisors is an integer number (102655977436).

Almost surely, 2^205311954871 is an apocalyptic number.

205311954871 is a deficient number, since it is larger than the sum of its proper divisors (1).

205311954871 is an equidigital number, since it uses as much as digits as its factorization.

205311954871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 205311954871 in words is "two hundred five billion, three hundred eleven million, nine hundred fifty-four thousand, eight hundred seventy-one".