12749329961 has 4 divisors (see below), whose sum is σ = 12794701524. Its totient is φ = 12703958400.

The previous prime is 12749329919. The next prime is 12749329963. The reversal of 12749329961 is 16992394721.

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 5801107225 + 6948222736 = 76165^2 + 83356^2 .

It is a cyclic number.

It is not a de Polignac number, because 12749329961 - 2¹⁰ = 12749328937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12749329963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22685360 + ... + 22685921.

It is an arithmetic number, because the mean of its divisors is an integer number (3198675381).

Almost surely, 2^12749329961 is an apocalyptic number.

It is an amenable number.

12749329961 is a deficient number, since it is larger than the sum of its proper divisors (45371563).

12749329961 is an equidigital number, since it uses as much as digits as its factorization.

12749329961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45371562.

The product of its digits is 1469664, while the sum is 53.

The spelling of 12749329961 in words is "twelve billion, seven hundred forty-nine million, three hundred twenty-nine thousand, nine hundred sixty-one".