12461987689 has 2 divisors, whose sum is σ = 12461987690. Its totient is φ = 12461987688.

The previous prime is 12461987669. The next prime is 12461987711. The reversal of 12461987689 is 98678916421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8544229225 + 3917758464 = 92435^2 + 62592^2 .

It is a cyclic number.

It is not a de Polignac number, because 12461987689 - 2¹⁹ = 12461463401 is a prime.

It is a super-2 number, since 2×12461987689² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12461987669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6230993844 + 6230993845.

It is an arithmetic number, because the mean of its divisors is an integer number (6230993845).

Almost surely, 2^12461987689 is an apocalyptic number.

It is an amenable number.

12461987689 is a deficient number, since it is larger than the sum of its proper divisors (1).

12461987689 is an equidigital number, since it uses as much as digits as its factorization.

12461987689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 61.

The spelling of 12461987689 in words is "twelve billion, four hundred sixty-one million, nine hundred eighty-seven thousand, six hundred eighty-nine".