12646732642 has 4 divisors (see below), whose sum is σ = 18970098966. Its totient is φ = 6323366320.

The previous prime is 12646732621. The next prime is 12646732661. The reversal of 12646732642 is 24623764621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24623764621 = 569 ⋅43275509.

It can be written as a sum of positive squares in only one way, i.e., 10909593601 + 1737139041 = 104449^2 + 41679^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3161683159 + ... + 3161683162.

Almost surely, 2^12646732642 is an apocalyptic number.

12646732642 is a deficient number, since it is larger than the sum of its proper divisors (6323366324).

12646732642 is an equidigital number, since it uses as much as digits as its factorization.

12646732642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6323366323.

The product of its digits is 580608, while the sum is 43.

The spelling of 12646732642 in words is "twelve billion, six hundred forty-six million, seven hundred thirty-two thousand, six hundred forty-two".