117893881661 has 2 divisors, whose sum is σ = 117893881662. Its totient is φ = 117893881660.

The previous prime is 117893881613. The next prime is 117893881663. The reversal of 117893881661 is 166188398711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67863376036 + 50030505625 = 260506^2 + 223675^2 .

It is a cyclic number.

It is not a de Polignac number, because 117893881661 - 2¹⁴ = 117893865277 is a prime.

Together with 117893881663, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117893881661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117893881663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58946940830 + 58946940831.

It is an arithmetic number, because the mean of its divisors is an integer number (58946940831).

Almost surely, 2^117893881661 is an apocalyptic number.

It is an amenable number.

117893881661 is a deficient number, since it is larger than the sum of its proper divisors (1).

117893881661 is an equidigital number, since it uses as much as digits as its factorization.

117893881661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 59.

The spelling of 117893881661 in words is "one hundred seventeen billion, eight hundred ninety-three million, eight hundred eighty-one thousand, six hundred sixty-one".