12735781273 has 4 divisors (see below), whose sum is σ = 12739226148. Its totient is φ = 12732336400.

The previous prime is 12735781249. The next prime is 12735781343. The reversal of 12735781273 is 37218753721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2321986969 + 10413794304 = 48187^2 + 102048^2 .

It is a cyclic number.

It is not a de Polignac number, because 12735781273 - 2²¹ = 12733684121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12735781213) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1716886 + ... + 1724287.

It is an arithmetic number, because the mean of its divisors is an integer number (3184806537).

Almost surely, 2^12735781273 is an apocalyptic number.

It is an amenable number.

12735781273 is a deficient number, since it is larger than the sum of its proper divisors (3444875).

12735781273 is an equidigital number, since it uses as much as digits as its factorization.

12735781273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444874.

The product of its digits is 493920, while the sum is 46.

The spelling of 12735781273 in words is "twelve billion, seven hundred thirty-five million, seven hundred eighty-one thousand, two hundred seventy-three".