81863890050 has 24 divisors (see below), whose sum is σ = 203022447696. Its totient is φ = 21830370640.

The previous prime is 81863890039. The next prime is 81863890093. The reversal of 81863890050 is 5009836818.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 272879484 + ... + 272879783.

It is an arithmetic number, because the mean of its divisors is an integer number (8459268654).

Almost surely, 2^81863890050 is an apocalyptic number.

81863890050 is an abundant number, since it is smaller than the sum of its proper divisors (121158557646).

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

81863890050 is a wasteful number, since it uses less digits than its factorization.

81863890050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545759282 (or 545759277 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 48.

The spelling of 81863890050 in words is "eighty-one billion, eight hundred sixty-three million, eight hundred ninety thousand, fifty".