12646420366 has 4 divisors (see below), whose sum is σ = 18969630552. Its totient is φ = 6323210182.

The previous prime is 12646420361. The next prime is 12646420393. The reversal of 12646420366 is 66302464621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66302464621 = 563 ⋅117766367.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12646420361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3161605090 + ... + 3161605093.

It is an arithmetic number, because the mean of its divisors is an integer number (4742407638).

Almost surely, 2^12646420366 is an apocalyptic number.

12646420366 is a deficient number, since it is larger than the sum of its proper divisors (6323210186).

12646420366 is an equidigital number, since it uses as much as digits as its factorization.

12646420366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6323210185.

The product of its (nonzero) digits is 248832, while the sum is 40.

Adding to 12646420366 its reverse (66302464621), we get a palindrome (78948884987).

The spelling of 12646420366 in words is "twelve billion, six hundred forty-six million, four hundred twenty thousand, three hundred sixty-six".