204172994025 has 432 divisors, whose sum is σ = 498283643520. Its totient is φ = 77599641600.

The previous prime is 204172994021. The next prime is 204172994063. The reversal of 204172994025 is 520499271402.

204172994025 is a `hidden beast` number, since 204 + 17 + 29 + 9 + 402 + 5 = 666.

It is not a de Polignac number, because 204172994025 - 2² = 204172994021 is a prime.

It is a super-2 number, since 2×204172994025² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (204172994021) by changing a digit.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 401125471 + ... + 401125979.

It is an arithmetic number, because the mean of its divisors is an integer number (1153434360).

Almost surely, 2^204172994025 is an apocalyptic number.

204172994025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

204172994025 is an abundant number, since it is smaller than the sum of its proper divisors (294110649495).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204172994025 is a wasteful number, since it uses less digits than its factorization.

204172994025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 685 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 204172994025 in words is "two hundred four billion, one hundred seventy-two million, nine hundred ninety-four thousand, twenty-five".