81859937649883 has 8 divisors (see below), whose sum is σ = 83758114440000. Its totient is φ = 79978784867208.

The previous prime is 81859937649863. The next prime is 81859937649887. The reversal of 81859937649883 is 38894673995818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81859937649883 - 2²⁹ = 81859400778971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81859937649794 and 81859937649803.

It is not an unprimeable number, because it can be changed into a prime (81859937649887) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4255992133 + ... + 4256011366.

It is an arithmetic number, because the mean of its divisors is an integer number (10469764305000).

Almost surely, 2^{81859937649883} is an apocalyptic number.

81859937649883 is a deficient number, since it is larger than the sum of its proper divisors (1898176790117).

81859937649883 is a wasteful number, since it uses less digits than its factorization.

81859937649883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8512003721.

The product of its digits is 22574039040, while the sum is 88.

The spelling of 81859937649883 in words is "eighty-one trillion, eight hundred fifty-nine billion, nine hundred thirty-seven million, six hundred forty-nine thousand, eight hundred eighty-three".