12315018857 has 2 divisors, whose sum is σ = 12315018858. Its totient is φ = 12315018856.

The previous prime is 12315018851. The next prime is 12315018871. The reversal of 12315018857 is 75881051321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11957203801 + 357815056 = 109349^2 + 18916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12315018857 is a prime.

It is not a weakly prime, because it can be changed into another prime (12315018851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6157509428 + 6157509429.

It is an arithmetic number, because the mean of its divisors is an integer number (6157509429).

Almost surely, 2^12315018857 is an apocalyptic number.

It is an amenable number.

12315018857 is a deficient number, since it is larger than the sum of its proper divisors (1).

12315018857 is an equidigital number, since it uses as much as digits as its factorization.

12315018857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 41.

The spelling of 12315018857 in words is "twelve billion, three hundred fifteen million, eighteen thousand, eight hundred fifty-seven".