117918751881 has 32 divisors (see below), whose sum is σ = 189167180800. Its totient is φ = 63827507520.

The previous prime is 117918751871. The next prime is 117918751889. The reversal of 117918751881 is 188157819711.

It is not a de Polignac number, because 117918751881 - 2⁵ = 117918751849 is a prime.

It is a super-2 number, since 2×117918751881² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117918751889) 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 31 ways as a sum of consecutive naturals, for example, 4339146 + ... + 4366236.

It is an arithmetic number, because the mean of its divisors is an integer number (5911474400).

Almost surely, 2^117918751881 is an apocalyptic number.

It is an amenable number.

117918751881 is a deficient number, since it is larger than the sum of its proper divisors (71248428919).

117918751881 is a wasteful number, since it uses less digits than its factorization.

117918751881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38029.

The product of its digits is 1128960, while the sum is 57.

The spelling of 117918751881 in words is "one hundred seventeen billion, nine hundred eighteen million, seven hundred fifty-one thousand, eight hundred eighty-one".