12061819681 has 2 divisors, whose sum is σ = 12061819682. Its totient is φ = 12061819680.

The previous prime is 12061819669. The next prime is 12061819687. The reversal of 12061819681 is 18691816021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9436179600 + 2625640081 = 97140^2 + 51241^2 .

It is a cyclic number.

It is not a de Polignac number, because 12061819681 - 2²⁷ = 11927601953 is a prime.

It is a super-2 number, since 2×12061819681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12061819687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6030909840 + 6030909841.

It is an arithmetic number, because the mean of its divisors is an integer number (6030909841).

Almost surely, 2^12061819681 is an apocalyptic number.

It is an amenable number.

12061819681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12061819681 is an equidigital number, since it uses as much as digits as its factorization.

12061819681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 43.

The spelling of 12061819681 in words is "twelve billion, sixty-one million, eight hundred nineteen thousand, six hundred eighty-one".