205450669 has 2 divisors, whose sum is σ = 205450670. Its totient is φ = 205450668.

The previous prime is 205450657. The next prime is 205450673. The reversal of 205450669 is 966054502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120165444 + 85285225 = 10962^2 + 9235^2 .

It is a cyclic number.

It is not a de Polignac number, because 205450669 - 2¹³ = 205442477 is a prime.

It is a super-2 number, since 2×205450669² = 84419954785095122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205450369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102725334 + 102725335.

It is an arithmetic number, because the mean of its divisors is an integer number (102725335).

Almost surely, 2^205450669 is an apocalyptic number.

It is an amenable number.

205450669 is a deficient number, since it is larger than the sum of its proper divisors (1).

205450669 is an equidigital number, since it uses as much as digits as its factorization.

205450669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 205450669 is about 14333.5504673476. The cubic root of 205450669 is about 590.0686207652.

The spelling of 205450669 in words is "two hundred five million, four hundred fifty thousand, six hundred sixty-nine".