117182711781 has 12 divisors (see below), whose sum is σ = 179220618252. Its totient is φ = 73526407296.

The previous prime is 117182711777. The next prime is 117182711791. The reversal of 117182711781 is 187117281711.

It can be written as a sum of positive squares in 2 ways, for example, as 99372474756 + 17810237025 = 315234^2 + 133455^2 .

It is not a de Polignac number, because 117182711781 - 2² = 117182711777 is a prime.

It is a super-2 number, since 2×117182711781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117182711731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 382949886 + ... + 382950191.

It is an arithmetic number, because the mean of its divisors is an integer number (14935051521).

Almost surely, 2^117182711781 is an apocalyptic number.

It is an amenable number.

117182711781 is a deficient number, since it is larger than the sum of its proper divisors (62037906471).

117182711781 is a wasteful number, since it uses less digits than its factorization.

117182711781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765900100 (or 765900097 counting only the distinct ones).

The product of its digits is 43904, while the sum is 45.

The spelling of 117182711781 in words is "one hundred seventeen billion, one hundred eighty-two million, seven hundred eleven thousand, seven hundred eighty-one".