12746838661 has 8 divisors (see below), whose sum is σ = 13094595864. Its totient is φ = 12399252480.

The previous prime is 12746838659. The next prime is 12746838673. The reversal of 12746838661 is 16683864721.

It can be written as a sum of positive squares in 4 ways, for example, as 8989884225 + 3756954436 = 94815^2 + 61294^2 .

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 12746838661 - 2¹ = 12746838659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12746838599 and 12746838608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12746838691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116301 + ... + 197533.

It is an arithmetic number, because the mean of its divisors is an integer number (1636824483).

Almost surely, 2^12746838661 is an apocalyptic number.

It is an amenable number.

12746838661 is a deficient number, since it is larger than the sum of its proper divisors (347757203).

12746838661 is an equidigital number, since it uses as much as digits as its factorization.

12746838661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85511.

The product of its digits is 2322432, while the sum is 52.

The spelling of 12746838661 in words is "twelve billion, seven hundred forty-six million, eight hundred thirty-eight thousand, six hundred sixty-one".