205199321816 has 8 divisors (see below), whose sum is σ = 384748728420. Its totient is φ = 102599660904.

The previous prime is 205199321783. The next prime is 205199321819. The reversal of 205199321816 is 618123991502.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205199321819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12824957606 + ... + 12824957621.

Almost surely, 2^205199321816 is an apocalyptic number.

It is an amenable number.

205199321816 is a deficient number, since it is larger than the sum of its proper divisors (179549406604).

205199321816 is a wasteful number, since it uses less digits than its factorization.

205199321816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25649915233 (or 25649915229 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 205199321816 in words is "two hundred five billion, one hundred ninety-nine million, three hundred twenty-one thousand, eight hundred sixteen".