12161057609 has 2 divisors, whose sum is σ = 12161057610. Its totient is φ = 12161057608.

The previous prime is 12161057603. The next prime is 12161057687. The reversal of 12161057609 is 90675016121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9832705600 + 2328352009 = 99160^2 + 48253^2 .

It is a cyclic number.

It is not a de Polignac number, because 12161057609 - 2⁸ = 12161057353 is a prime.

It is not a weakly prime, because it can be changed into another prime (12161057603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6080528804 + 6080528805.

It is an arithmetic number, because the mean of its divisors is an integer number (6080528805).

Almost surely, 2^12161057609 is an apocalyptic number.

It is an amenable number.

12161057609 is a deficient number, since it is larger than the sum of its proper divisors (1).

12161057609 is an equidigital number, since it uses as much as digits as its factorization.

12161057609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The spelling of 12161057609 in words is "twelve billion, one hundred sixty-one million, fifty-seven thousand, six hundred nine".