117912581779 has 4 divisors (see below), whose sum is σ = 117914056920. Its totient is φ = 117911106640.

The previous prime is 117912581767. The next prime is 117912581851. The reversal of 117912581779 is 977185219711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977185219711 = 29 ⋅33696042059.

It is a cyclic number.

It is not a de Polignac number, because 117912581779 - 2¹³ = 117912573587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117912588779) 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 3 ways as a sum of consecutive naturals, for example, 610357 + ... + 779974.

It is an arithmetic number, because the mean of its divisors is an integer number (29478514230).

Almost surely, 2^117912581779 is an apocalyptic number.

117912581779 is a deficient number, since it is larger than the sum of its proper divisors (1475141).

117912581779 is an equidigital number, since it uses as much as digits as its factorization.

117912581779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475140.

The product of its digits is 2222640, while the sum is 58.

The spelling of 117912581779 in words is "one hundred seventeen billion, nine hundred twelve million, five hundred eighty-one thousand, seven hundred seventy-nine".