12466991989 has 2 divisors, whose sum is σ = 12466991990. Its totient is φ = 12466991988.

The previous prime is 12466991981. The next prime is 12466991993. The reversal of 12466991989 is 98919966421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6714983025 + 5752008964 = 81945^2 + 75842^2 .

It is a cyclic number.

It is not a de Polignac number, because 12466991989 - 2³ = 12466991981 is a prime.

It is a super-2 number, since 2×12466991989² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12466991989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12466991981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6233495994 + 6233495995.

It is an arithmetic number, because the mean of its divisors is an integer number (6233495995).

Almost surely, 2^12466991989 is an apocalyptic number.

It is an amenable number.

12466991989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12466991989 is an equidigital number, since it uses as much as digits as its factorization.

12466991989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15116544, while the sum is 64.

The spelling of 12466991989 in words is "twelve billion, four hundred sixty-six million, nine hundred ninety-one thousand, nine hundred eighty-nine".