12578737217 has 2 divisors, whose sum is σ = 12578737218. Its totient is φ = 12578737216.

The previous prime is 12578737207. The next prime is 12578737261. The reversal of 12578737217 is 71273787521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12515120641 + 63616576 = 111871^2 + 7976^2 .

It is a cyclic number.

It is not a de Polignac number, because 12578737217 - 2¹² = 12578733121 is a prime.

It is not a weakly prime, because it can be changed into another prime (12578737207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6289368608 + 6289368609.

It is an arithmetic number, because the mean of its divisors is an integer number (6289368609).

Almost surely, 2^12578737217 is an apocalyptic number.

It is an amenable number.

12578737217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12578737217 is an equidigital number, since it uses as much as digits as its factorization.

12578737217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152480, while the sum is 50.

The spelling of 12578737217 in words is "twelve billion, five hundred seventy-eight million, seven hundred thirty-seven thousand, two hundred seventeen".