81758175112 has 64 divisors (see below), whose sum is σ = 165580531200. Its totient is φ = 37718991360.

The previous prime is 81758175091. The next prime is 81758175113. The reversal of 81758175112 is 21157185718.

It is not an unprimeable number, because it can be changed into a prime (81758175113) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3772018 + ... + 3793630.

It is an arithmetic number, because the mean of its divisors is an integer number (2587195800).

Almost surely, 2^81758175112 is an apocalyptic number.

81758175112 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

81758175112 is an abundant number, since it is smaller than the sum of its proper divisors (83822356088).

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

81758175112 is a wasteful number, since it uses less digits than its factorization.

81758175112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22286 (or 22282 counting only the distinct ones).

The product of its digits is 156800, while the sum is 46.

The spelling of 81758175112 in words is "eighty-one billion, seven hundred fifty-eight million, one hundred seventy-five thousand, one hundred twelve".