12399747161 has 4 divisors (see below), whose sum is σ = 12473997312. Its totient is φ = 12325497012.

The previous prime is 12399747127. The next prime is 12399747197. The reversal of 12399747161 is 16174799321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12399747161 - 2³⁰ = 11326005337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12399747461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37124825 + ... + 37125158.

It is an arithmetic number, because the mean of its divisors is an integer number (3118499328).

Almost surely, 2^12399747161 is an apocalyptic number.

It is an amenable number.

12399747161 is a deficient number, since it is larger than the sum of its proper divisors (74250151).

12399747161 is an equidigital number, since it uses as much as digits as its factorization.

12399747161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74250150.

The product of its digits is 571536, while the sum is 50.

The spelling of 12399747161 in words is "twelve billion, three hundred ninety-nine million, seven hundred forty-seven thousand, one hundred sixty-one".