81783334156 has 24 divisors (see below), whose sum is σ = 145647240480. Its totient is φ = 40171497600.

The previous prime is 81783334123. The next prime is 81783334169. The reversal of 81783334156 is 65143338718.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9760 + ... + 404551.

It is an arithmetic number, because the mean of its divisors is an integer number (6068635020).

Almost surely, 2^81783334156 is an apocalyptic number.

It is an amenable number.

81783334156 is a deficient number, since it is larger than the sum of its proper divisors (63863906324).

81783334156 is a wasteful number, since it uses less digits than its factorization.

81783334156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415185 (or 415183 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The spelling of 81783334156 in words is "eighty-one billion, seven hundred eighty-three million, three hundred thirty-four thousand, one hundred fifty-six".