12745881961 has 4 divisors (see below), whose sum is σ = 12775318612. Its totient is φ = 12716445312.

The previous prime is 12745881947. The next prime is 12745881977. The reversal of 12745881961 is 16918854721.

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 816873561 + 11929008400 = 28581^2 + 109220^2 .

It is a cyclic number.

It is not a de Polignac number, because 12745881961 - 2¹³ = 12745873769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12745881899 and 12745881908.

It is not an unprimeable number, because it can be changed into a prime (12745881991) 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, 14717676 + ... + 14718541.

It is an arithmetic number, because the mean of its divisors is an integer number (3193829653).

Almost surely, 2^12745881961 is an apocalyptic number.

It is an amenable number.

12745881961 is a deficient number, since it is larger than the sum of its proper divisors (29436651).

12745881961 is an equidigital number, since it uses as much as digits as its factorization.

12745881961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29436650.

The product of its digits is 967680, while the sum is 52.

The spelling of 12745881961 in words is "twelve billion, seven hundred forty-five million, eight hundred eighty-one thousand, nine hundred sixty-one".