12646190405 has 8 divisors (see below), whose sum is σ = 15383311512. Its totient is φ = 9978363648.

The previous prime is 12646190387. The next prime is 12646190413. The reversal of 12646190405 is 50409164621.

12646190405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1345862596 + 11300327809 = 36686^2 + 106303^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12646190405 - 2⁸ = 12646190149 is a prime.

It is a super-2 number, since 2×12646190405² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17323184 + ... + 17323913.

It is an arithmetic number, because the mean of its divisors is an integer number (1922913939).

Almost surely, 2^12646190405 is an apocalyptic number.

It is an amenable number.

12646190405 is a deficient number, since it is larger than the sum of its proper divisors (2737121107).

12646190405 is an equidigital number, since it uses as much as digits as its factorization.

12646190405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34647175.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 12646190405 in words is "twelve billion, six hundred forty-six million, one hundred ninety thousand, four hundred five".