204687216807 has 24 divisors (see below), whose sum is σ = 287630746752. Its totient is φ = 129232408800.

The previous prime is 204687216739. The next prime is 204687216889. The reversal of 204687216807 is 708612786402.

204687216807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204687216807 - 2¹² = 204687212711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204687216807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204687216907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 558468 + ... + 849270.

It is an arithmetic number, because the mean of its divisors is an integer number (11984614448).

Almost surely, 2^204687216807 is an apocalyptic number.

204687216807 is a deficient number, since it is larger than the sum of its proper divisors (82943529945).

204687216807 is a wasteful number, since it uses less digits than its factorization.

204687216807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291031 (or 290930 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 204687216807 in words is "two hundred four billion, six hundred eighty-seven million, two hundred sixteen thousand, eight hundred seven".