81407873446 has 16 divisors (see below), whose sum is σ = 129831364080. Its totient is φ = 38150622720.

The previous prime is 81407873381. The next prime is 81407873501. The reversal of 81407873446 is 64437870418.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81407873393 and 81407873402.

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 7 ways as a sum of consecutive naturals, for example, 4959336 + ... + 4975723.

It is an arithmetic number, because the mean of its divisors is an integer number (8114460255).

Almost surely, 2^81407873446 is an apocalyptic number.

81407873446 is a deficient number, since it is larger than the sum of its proper divisors (48423490634).

81407873446 is a wasteful number, since it uses less digits than its factorization.

81407873446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9935319.

The product of its (nonzero) digits is 3612672, while the sum is 52.

The spelling of 81407873446 in words is "eighty-one billion, four hundred seven million, eight hundred seventy-three thousand, four hundred forty-six".