12118881581 has 2 divisors, whose sum is σ = 12118881582. Its totient is φ = 12118881580.

The previous prime is 12118881497. The next prime is 12118881589. The reversal of 12118881581 is 18518881121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8691832900 + 3427048681 = 93230^2 + 58541^2 .

It is a cyclic number.

It is not a de Polignac number, because 12118881581 - 2³⁰ = 11045139757 is a prime.

It is a super-2 number, since 2×12118881581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12118881589) 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 as a sum of consecutive naturals, namely, 6059440790 + 6059440791.

It is an arithmetic number, because the mean of its divisors is an integer number (6059440791).

Almost surely, 2^12118881581 is an apocalyptic number.

It is an amenable number.

12118881581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12118881581 is an equidigital number, since it uses as much as digits as its factorization.

12118881581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40960, while the sum is 44.

The spelling of 12118881581 in words is "twelve billion, one hundred eighteen million, eight hundred eighty-one thousand, five hundred eighty-one".