204430421665 has 16 divisors (see below), whose sum is σ = 254069913600. Its totient is φ = 157721808832.

The previous prime is 204430421639. The next prime is 204430421693. The reversal of 204430421665 is 566124034402.

It is a cyclic number.

It is not a de Polignac number, because 204430421665 - 2³¹ = 202282938017 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 691705 + ... + 941974.

It is an arithmetic number, because the mean of its divisors is an integer number (15879369600).

Almost surely, 2^204430421665 is an apocalyptic number.

It is an amenable number.

204430421665 is a deficient number, since it is larger than the sum of its proper divisors (49639491935).

204430421665 is a wasteful number, since it uses less digits than its factorization.

204430421665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634576.

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 204430421665 in words is "two hundred four billion, four hundred thirty million, four hundred twenty-one thousand, six hundred sixty-five".