12236563861 has 2 divisors, whose sum is σ = 12236563862. Its totient is φ = 12236563860.

The previous prime is 12236563853. The next prime is 12236563883. The reversal of 12236563861 is 16836563221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11216080836 + 1020483025 = 105906^2 + 31945^2 .

It is a cyclic number.

It is not a de Polignac number, because 12236563861 - 2³ = 12236563853 is a prime.

It is a super-3 number, since 3×12236563861³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12236563811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6118281930 + 6118281931.

It is an arithmetic number, because the mean of its divisors is an integer number (6118281931).

Almost surely, 2^12236563861 is an apocalyptic number.

It is an amenable number.

12236563861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12236563861 is an equidigital number, since it uses as much as digits as its factorization.

12236563861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 43.

The spelling of 12236563861 in words is "twelve billion, two hundred thirty-six million, five hundred sixty-three thousand, eight hundred sixty-one".