81933948692 has 12 divisors (see below), whose sum is σ = 143391220980. Its totient is φ = 40965028416.

The previous prime is 81933948673. The next prime is 81933948721. The reversal of 81933948692 is 29684933918.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14809429636 + 67124519056 = 121694^2 + 259084^2 .

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, 389603 + ... + 561834.

It is an arithmetic number, because the mean of its divisors is an integer number (11949268415).

Almost surely, 2^81933948692 is an apocalyptic number.

It is an amenable number.

81933948692 is a deficient number, since it is larger than the sum of its proper divisors (61457272288).

81933948692 is a wasteful number, since it uses less digits than its factorization.

81933948692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972970 (or 972968 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 62.

The spelling of 81933948692 in words is "eighty-one billion, nine hundred thirty-three million, nine hundred forty-eight thousand, six hundred ninety-two".