204923172069 has 96 divisors (see below), whose sum is σ = 374966492160. Its totient is φ = 104747385600.

The previous prime is 204923172067. The next prime is 204923172073. The reversal of 204923172069 is 960271329402.

204923172069 is a `hidden beast` number, since 2 + 0 + 492 + 31 + 72 + 0 + 69 = 666.

It is not a de Polignac number, because 204923172069 - 2¹ = 204923172067 is a prime.

It is a super-2 number, since 2×204923172069² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204923172067) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 54368817 + ... + 54372585.

It is an arithmetic number, because the mean of its divisors is an integer number (3905900960).

Almost surely, 2^204923172069 is an apocalyptic number.

It is an amenable number.

204923172069 is a deficient number, since it is larger than the sum of its proper divisors (170043320091).

204923172069 is a wasteful number, since it uses less digits than its factorization.

204923172069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5031 (or 5028 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 204923172069 in words is "two hundred four billion, nine hundred twenty-three million, one hundred seventy-two thousand, sixty-nine".