12340646657 has 4 divisors (see below), whose sum is σ = 12340916820. Its totient is φ = 12340376496.

The previous prime is 12340646651. The next prime is 12340646713. The reversal of 12340646657 is 75664604321.

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 9644025616 + 2696621041 = 98204^2 + 51929^2 .

It is a cyclic number.

It is not a de Polignac number, because 12340646657 - 2⁴ = 12340646641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12340646651) 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, 47738 + ... + 164195.

It is an arithmetic number, because the mean of its divisors is an integer number (3085229205).

Almost surely, 2^12340646657 is an apocalyptic number.

It is an amenable number.

12340646657 is a deficient number, since it is larger than the sum of its proper divisors (270163).

12340646657 is an equidigital number, since it uses as much as digits as its factorization.

12340646657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270162.

The product of its (nonzero) digits is 725760, while the sum is 44.

The spelling of 12340646657 in words is "twelve billion, three hundred forty million, six hundred forty-six thousand, six hundred fifty-seven".