204763906989 has 24 divisors (see below), whose sum is σ = 307339396000. Its totient is φ = 136235624976.

The previous prime is 204763906957. The next prime is 204763906993. The reversal of 204763906989 is 989609367402.

204763906989 is a `hidden beast` number, since 20 + 476 + 3 + 9 + 0 + 69 + 89 = 666.

It is not a de Polignac number, because 204763906989 - 2⁵ = 204763906957 is a prime.

It is a super-2 number, since 2×204763906989² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204763906189) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 723082 + ... + 965595.

Almost surely, 2^204763906989 is an apocalyptic number.

It is an amenable number.

204763906989 is a deficient number, since it is larger than the sum of its proper divisors (102575489011).

204763906989 is an equidigital number, since it uses as much as digits as its factorization.

204763906989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689191 (or 1689179 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 63.

The spelling of 204763906989 in words is "two hundred four billion, seven hundred sixty-three million, nine hundred six thousand, nine hundred eighty-nine".