12551361517 has 2 divisors, whose sum is σ = 12551361518. Its totient is φ = 12551361516.

The previous prime is 12551361457. The next prime is 12551361551. The reversal of 12551361517 is 71516315521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11297776681 + 1253584836 = 106291^2 + 35406^2 .

It is a cyclic number.

It is not a de Polignac number, because 12551361517 - 2²³ = 12542972909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12551361587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6275680758 + 6275680759.

It is an arithmetic number, because the mean of its divisors is an integer number (6275680759).

Almost surely, 2^12551361517 is an apocalyptic number.

It is an amenable number.

12551361517 is a deficient number, since it is larger than the sum of its proper divisors (1).

12551361517 is an equidigital number, since it uses as much as digits as its factorization.

12551361517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31500, while the sum is 37.

The spelling of 12551361517 in words is "twelve billion, five hundred fifty-one million, three hundred sixty-one thousand, five hundred seventeen".