209673761830 has 32 divisors (see below), whose sum is σ = 406547979264. Its totient is φ = 77398298496.

The previous prime is 209673761827. The next prime is 209673761867. The reversal of 209673761830 is 38167376902.

It is a happy number.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 312424 + ... + 718996.

It is an arithmetic number, because the mean of its divisors is an integer number (12704624352).

Almost surely, 2^209673761830 is an apocalyptic number.

209673761830 is a deficient number, since it is larger than the sum of its proper divisors (196874217434).

209673761830 is a wasteful number, since it uses less digits than its factorization.

209673761830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410560.

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 209673761830 in words is "two hundred nine billion, six hundred seventy-three million, seven hundred sixty-one thousand, eight hundred thirty".