204631871807457 has 16 divisors (see below), whose sum is σ = 303159149985280. Its totient is φ = 136420878249936.

The previous prime is 204631871807437. The next prime is 204631871807471. The reversal of 204631871807457 is 754708178136402.

It is a happy number.

204631871807457 is a `hidden beast` number, since 2 + 0 + 4 + 6 + 31 + 8 + 71 + 80 + 7 + 457 = 666.

204631871807457 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204631871807457 - 2¹² = 204631871803361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204631871807394 and 204631871807403.

It is not an unprimeable number, because it can be changed into a prime (204631871807437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71823 + ... + 20230395.

It is an arithmetic number, because the mean of its divisors is an integer number (18947446874080).

Almost surely, 2^{204631871807457} is an apocalyptic number.

204631871807457 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

204631871807457 is a deficient number, since it is larger than the sum of its proper divisors (98527278177823).

204631871807457 is a wasteful number, since it uses less digits than its factorization.

204631871807457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20534549 (or 20534543 counting only the distinct ones).

The product of its (nonzero) digits is 63221760, while the sum is 63.

The spelling of 204631871807457 in words is "two hundred four trillion, six hundred thirty-one billion, eight hundred seventy-one million, eight hundred seven thousand, four hundred fifty-seven".