205019761808 has 10 divisors (see below), whose sum is σ = 397225788534. Its totient is φ = 102509880896.

The previous prime is 205019761799. The next prime is 205019761823. The reversal of 205019761808 is 808167910502.

It can be written as a sum of positive squares in only one way, i.e., 183348388864 + 21671372944 = 428192^2 + 147212^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6406867541 + ... + 6406867572.

Almost surely, 2^205019761808 is an apocalyptic number.

It is an amenable number.

205019761808 is a deficient number, since it is larger than the sum of its proper divisors (192206026726).

205019761808 is a wasteful number, since it uses less digits than its factorization.

205019761808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12813735121 (or 12813735115 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 205019761808 in words is "two hundred five billion, nineteen million, seven hundred sixty-one thousand, eight hundred eight".