81844823875 has 16 divisors (see below), whose sum is σ = 102153179232. Its totient is φ = 65468911200.

The previous prime is 81844823861. The next prime is 81844823989. The reversal of 81844823875 is 57832844818.

It is a happy number.

It is not a de Polignac number, because 81844823875 - 2⁷ = 81844823747 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1376257 + ... + 1434493.

It is an arithmetic number, because the mean of its divisors is an integer number (6384573702).

Almost surely, 2^81844823875 is an apocalyptic number.

81844823875 is a deficient number, since it is larger than the sum of its proper divisors (20308355357).

81844823875 is a wasteful number, since it uses less digits than its factorization.

81844823875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69495 (or 69485 counting only the distinct ones).

The product of its digits is 13762560, while the sum is 58.

The spelling of 81844823875 in words is "eighty-one billion, eight hundred forty-four million, eight hundred twenty-three thousand, eight hundred seventy-five".