81117000075 has 24 divisors (see below), whose sum is σ = 134126137600. Its totient is φ = 43258304160.

The previous prime is 81117000053. The next prime is 81117000077. The reversal of 81117000075 is 57000071118.

It is a happy number.

It is not a de Polignac number, because 81117000075 - 2⁵ = 81117000043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81117000077) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 851706 + ... + 942144.

Almost surely, 2^81117000075 is an apocalyptic number.

81117000075 is a deficient number, since it is larger than the sum of its proper divisors (53009137525).

81117000075 is a wasteful number, since it uses less digits than its factorization.

81117000075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102411 (or 102406 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 30.

The spelling of 81117000075 in words is "eighty-one billion, one hundred seventeen million, seventy-five", and thus it is an aban number.