204070661 has 2 divisors, whose sum is σ = 204070662. Its totient is φ = 204070660.

The previous prime is 204070649. The next prime is 204070729. The reversal of 204070661 is 166070402.

204070661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187416100 + 16654561 = 13690^2 + 4081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204070661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204070661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204070631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102035330 + 102035331.

It is an arithmetic number, because the mean of its divisors is an integer number (102035331).

Almost surely, 2^204070661 is an apocalyptic number.

It is an amenable number.

204070661 is a deficient number, since it is larger than the sum of its proper divisors (1).

204070661 is an equidigital number, since it uses as much as digits as its factorization.

204070661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 204070661 is about 14285.3302726958. The cubic root of 204070661 is about 588.7444919345.

The spelling of 204070661 in words is "two hundred four million, seventy thousand, six hundred sixty-one".