12355257617 has 2 divisors, whose sum is σ = 12355257618. Its totient is φ = 12355257616.

The previous prime is 12355257581. The next prime is 12355257659. The reversal of 12355257617 is 71675255321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11217139921 + 1138117696 = 105911^2 + 33736^2 .

It is a cyclic number.

It is not a de Polignac number, because 12355257617 - 2²² = 12351063313 is a prime.

It is not a weakly prime, because it can be changed into another prime (12355250617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6177628808 + 6177628809.

It is an arithmetic number, because the mean of its divisors is an integer number (6177628809).

Almost surely, 2^12355257617 is an apocalyptic number.

It is an amenable number.

12355257617 is a deficient number, since it is larger than the sum of its proper divisors (1).

12355257617 is an equidigital number, since it uses as much as digits as its factorization.

12355257617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 441000, while the sum is 44.

The spelling of 12355257617 in words is "twelve billion, three hundred fifty-five million, two hundred fifty-seven thousand, six hundred seventeen".