204883887661 has 2 divisors, whose sum is σ = 204883887662. Its totient is φ = 204883887660.

The previous prime is 204883887641. The next prime is 204883887667. The reversal of 204883887661 is 166788388402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166929444900 + 37954442761 = 408570^2 + 194819^2 .

It is a cyclic number.

It is not a de Polignac number, because 204883887661 - 2¹⁷ = 204883756589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204883887661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204883887667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102441943830 + 102441943831.

It is an arithmetic number, because the mean of its divisors is an integer number (102441943831).

Almost surely, 2^204883887661 is an apocalyptic number.

It is an amenable number.

204883887661 is a deficient number, since it is larger than the sum of its proper divisors (1).

204883887661 is an equidigital number, since it uses as much as digits as its factorization.

204883887661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24772608, while the sum is 61.

The spelling of 204883887661 in words is "two hundred four billion, eight hundred eighty-three million, eight hundred eighty-seven thousand, six hundred sixty-one".