12663414961 has 4 divisors (see below), whose sum is σ = 12685362532. Its totient is φ = 12641467392.

The previous prime is 12663414941. The next prime is 12663414979. The reversal of 12663414961 is 16941436621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8412374961 + 4251040000 = 91719^2 + 65200^2 .

It is a cyclic number.

It is not a de Polignac number, because 12663414961 - 2¹⁷ = 12663283889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12663414941) 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, 10972920 + ... + 10974073.

It is an arithmetic number, because the mean of its divisors is an integer number (3171340633).

Almost surely, 2^12663414961 is an apocalyptic number.

It is an amenable number.

12663414961 is a deficient number, since it is larger than the sum of its proper divisors (21947571).

12663414961 is an equidigital number, since it uses as much as digits as its factorization.

12663414961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21947570.

The product of its digits is 186624, while the sum is 43.

The spelling of 12663414961 in words is "twelve billion, six hundred sixty-three million, four hundred fourteen thousand, nine hundred sixty-one".