205269469784490 has 64 divisors (see below), whose sum is σ = 493943084570880. Its totient is φ = 54594516556800.

The previous prime is 205269469784443. The next prime is 205269469784497. The reversal of 205269469784490 is 94487964962502.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (205269469784497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105643666 + ... + 107569154.

It is an arithmetic number, because the mean of its divisors is an integer number (7717860696420).

Almost surely, 2^{205269469784490} is an apocalyptic number.

205269469784490 is an abundant number, since it is smaller than the sum of its proper divisors (288673614786390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205269469784490 is a wasteful number, since it uses less digits than its factorization.

205269469784490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934847.

The product of its (nonzero) digits is 1881169920, while the sum is 75.

The spelling of 205269469784490 in words is "two hundred five trillion, two hundred sixty-nine billion, four hundred sixty-nine million, seven hundred eighty-four thousand, four hundred ninety".