12661863 has 8 divisors (see below), whose sum is σ = 16916976. Its totient is φ = 8424000.

The previous prime is 12661853. The next prime is 12661877. The reversal of 12661863 is 36816621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12661863 - 2¹⁶ = 12596327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661843) 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 7 ways as a sum of consecutive naturals, for example, 2488 + ... + 5613.

It is an arithmetic number, because the mean of its divisors is an integer number (2114622).

Almost surely, 2^12661863 is an apocalyptic number.

12661863 is a deficient number, since it is larger than the sum of its proper divisors (4255113).

12661863 is an equidigital number, since it uses as much as digits as its factorization.

12661863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8625.

The product of its digits is 10368, while the sum is 33.

The square root of 12661863 is about 3558.3511631091. The cubic root of 12661863 is about 233.0768840075.

The spelling of 12661863 in words is "twelve million, six hundred sixty-one thousand, eight hundred sixty-three".