204660450891 has 24 divisors (see below), whose sum is σ = 318473435280. Its totient is φ = 125900294976.

The previous prime is 204660450889. The next prime is 204660450937. The reversal of 204660450891 is 198054066402.

204660450891 is a `hidden beast` number, since 20 + 46 + 60 + 450 + 89 + 1 = 666.

It is not a de Polignac number, because 204660450891 - 2¹ = 204660450889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204660450821) 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, 23640 + ... + 640218.

It is an arithmetic number, because the mean of its divisors is an integer number (13269726470).

Almost surely, 2^204660450891 is an apocalyptic number.

204660450891 is a deficient number, since it is larger than the sum of its proper divisors (113812984389).

204660450891 is a wasteful number, since it uses less digits than its factorization.

204660450891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619435 (or 619432 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 204660450891 in words is "two hundred four billion, six hundred sixty million, four hundred fifty thousand, eight hundred ninety-one".