204661551 has 8 divisors (see below), whose sum is σ = 272954880. Its totient is φ = 136404632.

The previous prime is 204661549. The next prime is 204661571. The reversal of 204661551 is 155166402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204661551 - 2¹ = 204661549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204661511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9376 + ... + 22298.

It is an arithmetic number, because the mean of its divisors is an integer number (34119360).

Almost surely, 2^204661551 is an apocalyptic number.

204661551 is a deficient number, since it is larger than the sum of its proper divisors (68293329).

204661551 is a wasteful number, since it uses less digits than its factorization.

204661551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18205.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 204661551 is about 14305.9970292182. The cubic root of 204661551 is about 589.3121841952.

The spelling of 204661551 in words is "two hundred four million, six hundred sixty-one thousand, five hundred fifty-one".