81990327095850 has 48 divisors (see below), whose sum is σ = 204700682469600. Its totient is φ = 21717348379200.

The previous prime is 81990327095849. The next prime is 81990327095879. The reversal of 81990327095850 is 5859072309918.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1834213156 + ... + 1834257855.

It is an arithmetic number, because the mean of its divisors is an integer number (4264597551450).

Almost surely, 2^{81990327095850} is an apocalyptic number.

81990327095850 is an abundant number, since it is smaller than the sum of its proper divisors (122710355373750).

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

81990327095850 is a wasteful number, since it uses less digits than its factorization.

81990327095850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668471175 (or 3668471170 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 66.

The spelling of 81990327095850 in words is "eighty-one trillion, nine hundred ninety billion, three hundred twenty-seven million, ninety-five thousand, eight hundred fifty".