12661963 has 4 divisors (see below), whose sum is σ = 12728448. Its totient is φ = 12595480.

The previous prime is 12661949. The next prime is 12661973. The reversal of 12661963 is 36916621.

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

It is a cyclic number.

It is not a de Polignac number, because 12661963 - 2¹⁷ = 12530891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12661903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32956 + ... + 33337.

It is an arithmetic number, because the mean of its divisors is an integer number (3182112).

Almost surely, 2^12661963 is an apocalyptic number.

12661963 is a deficient number, since it is larger than the sum of its proper divisors (66485).

12661963 is an equidigital number, since it uses as much as digits as its factorization.

12661963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66484.

The product of its digits is 11664, while the sum is 34.

The square root of 12661963 is about 3558.3652145332. The cubic root of 12661963 is about 233.0774975988.

The spelling of 12661963 in words is "twelve million, six hundred sixty-one thousand, nine hundred sixty-three".