12787439551217 has 2 divisors, whose sum is σ = 12787439551218. Its totient is φ = 12787439551216.

The previous prime is 12787439551123. The next prime is 12787439551253. The reversal of 12787439551217 is 71215593478721.

12787439551217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11195441629681 + 1591997921536 = 3345959^2 + 1261744^2 .

It is a cyclic number.

It is not a de Polignac number, because 12787439551217 - 2⁴² = 8389393040113 is a prime.

It is a super-2 number, since 2×12787439551217² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12787439551217.

It is not a weakly prime, because it can be changed into another prime (12787439551277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6393719775608 + 6393719775609.

It is an arithmetic number, because the mean of its divisors is an integer number (6393719775609).

Almost surely, 2^{12787439551217} is an apocalyptic number.

It is an amenable number.

12787439551217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12787439551217 is an equidigital number, since it uses as much as digits as its factorization.

12787439551217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29635200, while the sum is 62.

The spelling of 12787439551217 in words is "twelve trillion, seven hundred eighty-seven billion, four hundred thirty-nine million, five hundred fifty-one thousand, two hundred seventeen".