204808257871 has 4 divisors (see below), whose sum is σ = 234066580432. Its totient is φ = 175549935312.

The previous prime is 204808257811. The next prime is 204808257889. The reversal of 204808257871 is 178752808402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204808257871 - 2⁷ = 204808257743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204808257811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14629161270 + ... + 14629161283.

It is an arithmetic number, because the mean of its divisors is an integer number (58516645108).

Almost surely, 2^204808257871 is an apocalyptic number.

204808257871 is a deficient number, since it is larger than the sum of its proper divisors (29258322561).

204808257871 is an equidigital number, since it uses as much as digits as its factorization.

204808257871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29258322560.

The product of its (nonzero) digits is 2007040, while the sum is 52.

The spelling of 204808257871 in words is "two hundred four billion, eight hundred eight million, two hundred fifty-seven thousand, eight hundred seventy-one".