81945119846 has 8 divisors (see below), whose sum is σ = 123855983064. Its totient is φ = 40659792160.

The previous prime is 81945119827. The next prime is 81945119869. The reversal of 81945119846 is 64891154918.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81945119791 and 81945119800.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 156383555 + ... + 156384078.

It is an arithmetic number, because the mean of its divisors is an integer number (15481997883).

Almost surely, 2^81945119846 is an apocalyptic number.

81945119846 is a deficient number, since it is larger than the sum of its proper divisors (41910863218).

81945119846 is a wasteful number, since it uses less digits than its factorization.

81945119846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312767766.

The product of its digits is 2488320, while the sum is 56.

The spelling of 81945119846 in words is "eighty-one billion, nine hundred forty-five million, one hundred nineteen thousand, eight hundred forty-six".