81975590336 has 28 divisors (see below), whose sum is σ = 162712027128. Its totient is φ = 40977284352.

The previous prime is 81975590317. The next prime is 81975590353. The reversal of 81975590336 is 63309557918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90350 + ... + 414866.

It is an arithmetic number, because the mean of its divisors is an integer number (5811143826).

Almost surely, 2^81975590336 is an apocalyptic number.

It is an amenable number.

81975590336 is a deficient number, since it is larger than the sum of its proper divisors (80736436792).

81975590336 is a wasteful number, since it uses less digits than its factorization.

81975590336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328476 (or 328466 counting only the distinct ones).

The product of its (nonzero) digits is 6123600, while the sum is 56.

The spelling of 81975590336 in words is "eighty-one billion, nine hundred seventy-five million, five hundred ninety thousand, three hundred thirty-six".