81895875650 has 24 divisors (see below), whose sum is σ = 161286702660. Its totient is φ = 30831388160.

The previous prime is 81895875641. The next prime is 81895875757. The reversal of 81895875650 is 5657859818.

It can be written as a sum of positive squares in 6 ways, for example, as 41391495601 + 40504380049 = 203449^2 + 201257^2 .

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 48173195 + ... + 48174894.

Almost surely, 2^81895875650 is an apocalyptic number.

81895875650 is a deficient number, since it is larger than the sum of its proper divisors (79390827010).

81895875650 is a wasteful number, since it uses less digits than its factorization.

81895875650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96348118 (or 96348113 counting only the distinct ones).

The product of its (nonzero) digits is 24192000, while the sum is 62.

The spelling of 81895875650 in words is "eighty-one billion, eight hundred ninety-five million, eight hundred seventy-five thousand, six hundred fifty".