81798625992 has 16 divisors (see below), whose sum is σ = 204496565040. Its totient is φ = 27266208656.

The previous prime is 81798625973. The next prime is 81798626057. The reversal of 81798625992 is 29952689718.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1704138018 + ... + 1704138065.

It is an arithmetic number, because the mean of its divisors is an integer number (12781035315).

Almost surely, 2^81798625992 is an apocalyptic number.

It is an amenable number.

81798625992 is an abundant number, since it is smaller than the sum of its proper divisors (122697939048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81798625992 is a wasteful number, since it uses less digits than its factorization.

81798625992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3408276092 (or 3408276088 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 66.

The spelling of 81798625992 in words is "eighty-one billion, seven hundred ninety-eight million, six hundred twenty-five thousand, nine hundred ninety-two".