204864045871 has 2 divisors, whose sum is σ = 204864045872. Its totient is φ = 204864045870.

The previous prime is 204864045839. The next prime is 204864045899. The reversal of 204864045871 is 178540468402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204864045871 - 2⁵ = 204864045839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204864045571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102432022935 + 102432022936.

It is an arithmetic number, because the mean of its divisors is an integer number (102432022936).

Almost surely, 2^204864045871 is an apocalyptic number.

204864045871 is a deficient number, since it is larger than the sum of its proper divisors (1).

204864045871 is an equidigital number, since it uses as much as digits as its factorization.

204864045871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1720320, while the sum is 49.

The spelling of 204864045871 in words is "two hundred four billion, eight hundred sixty-four million, forty-five thousand, eight hundred seventy-one".