81932281316 has 24 divisors (see below), whose sum is σ = 146738027520. Its totient is φ = 40010772032.

The previous prime is 81932281267. The next prime is 81932281339. The reversal of 81932281316 is 61318223918.

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, 364865 + ... + 544968.

It is an arithmetic number, because the mean of its divisors is an integer number (6114084480).

Almost surely, 2^81932281316 is an apocalyptic number.

It is an amenable number.

81932281316 is a deficient number, since it is larger than the sum of its proper divisors (64805746204).

81932281316 is a wasteful number, since it uses less digits than its factorization.

81932281316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910363 (or 910361 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The spelling of 81932281316 in words is "eighty-one billion, nine hundred thirty-two million, two hundred eighty-one thousand, three hundred sixteen".