12440340697 has 2 divisors, whose sum is σ = 12440340698. Its totient is φ = 12440340696.

The previous prime is 12440340691. The next prime is 12440340713. The reversal of 12440340697 is 79604304421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7996651776 + 4443688921 = 89424^2 + 66661^2 .

It is an emirp because it is prime and its reverse (79604304421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12440340697 is a prime.

It is not a weakly prime, because it can be changed into another prime (12440340691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220170348 + 6220170349.

It is an arithmetic number, because the mean of its divisors is an integer number (6220170349).

Almost surely, 2^12440340697 is an apocalyptic number.

It is an amenable number.

12440340697 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440340697 is an equidigital number, since it uses as much as digits as its factorization.

12440340697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 12440340697 in words is "twelve billion, four hundred forty million, three hundred forty thousand, six hundred ninety-seven".