12161556419 has 2 divisors, whose sum is σ = 12161556420. Its totient is φ = 12161556418.

The previous prime is 12161556361. The next prime is 12161556439. The reversal of 12161556419 is 91465516121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12161556419 - 2⁸ = 12161556163 is a prime.

It is a super-2 number, since 2×12161556419² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12161556439) 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, 6080778209 + 6080778210.

It is an arithmetic number, because the mean of its divisors is an integer number (6080778210).

Almost surely, 2^12161556419 is an apocalyptic number.

12161556419 is a deficient number, since it is larger than the sum of its proper divisors (1).

12161556419 is an equidigital number, since it uses as much as digits as its factorization.

12161556419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The spelling of 12161556419 in words is "twelve billion, one hundred sixty-one million, five hundred fifty-six thousand, four hundred nineteen".