204661669 has 2 divisors, whose sum is σ = 204661670. Its totient is φ = 204661668.

The previous prime is 204661621. The next prime is 204661679. The reversal of 204661669 is 966166402.

204661669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133056225 + 71605444 = 11535^2 + 8462^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204661669 is a prime.

It is a super-2 number, since 2×204661669² = 83772797515731122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204661679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102330834 + 102330835.

It is an arithmetic number, because the mean of its divisors is an integer number (102330835).

Almost surely, 2^204661669 is an apocalyptic number.

It is an amenable number.

204661669 is a deficient number, since it is larger than the sum of its proper divisors (1).

204661669 is an equidigital number, since it uses as much as digits as its factorization.

204661669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 204661669 is about 14306.0011533622. The cubic root of 204661669 is about 589.3122974535.

The spelling of 204661669 in words is "two hundred four million, six hundred sixty-one thousand, six hundred sixty-nine".