12663436261 has 4 divisors (see below), whose sum is σ = 14472498592. Its totient is φ = 10854373932.

The previous prime is 12663436213. The next prime is 12663436277. The reversal of 12663436261 is 16263436621.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16263436621 = 181 ⋅89853241.

It is a cyclic number.

It is not a de Polignac number, because 12663436261 - 2¹³ = 12663428069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12663437261) 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, 904531155 + ... + 904531168.

It is an arithmetic number, because the mean of its divisors is an integer number (3618124648).

Almost surely, 2^12663436261 is an apocalyptic number.

It is an amenable number.

12663436261 is a deficient number, since it is larger than the sum of its proper divisors (1809062331).

12663436261 is an equidigital number, since it uses as much as digits as its factorization.

12663436261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809062330.

The product of its digits is 186624, while the sum is 40.

The spelling of 12663436261 in words is "twelve billion, six hundred sixty-three million, four hundred thirty-six thousand, two hundred sixty-one".