81803638107650 has 24 divisors (see below), whose sum is σ = 155693249835024. Its totient is φ = 31960491166800.

The previous prime is 81803638107649. The next prime is 81803638107677. The reversal of 81803638107650 is 5670183630818.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19024099736 + ... + 19024104035.

It is an arithmetic number, because the mean of its divisors is an integer number (6487218743126).

Almost surely, 2^{81803638107650} is an apocalyptic number.

81803638107650 is a deficient number, since it is larger than the sum of its proper divisors (73889611727374).

81803638107650 is a wasteful number, since it uses less digits than its factorization.

81803638107650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38048203826 (or 38048203821 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 81803638107650 in words is "eighty-one trillion, eight hundred three billion, six hundred thirty-eight million, one hundred seven thousand, six hundred fifty".