13187446759681 has 2 divisors, whose sum is σ = 13187446759682. Its totient is φ = 13187446759680.

The previous prime is 13187446759601. The next prime is 13187446759691. The reversal of 13187446759681 is 18695764478131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11448688055281 + 1738758704400 = 3383591^2 + 1318620^2 .

It is a cyclic number.

It is not a de Polignac number, because 13187446759681 - 2¹³ = 13187446751489 is a prime.

It is a super-2 number, since 2×13187446759681² (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 13187446759681.

It is not a weakly prime, because it can be changed into another prime (13187446759601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6593723379840 + 6593723379841.

It is an arithmetic number, because the mean of its divisors is an integer number (6593723379841).

Almost surely, 2^{13187446759681} is an apocalyptic number.

It is an amenable number.

13187446759681 is a deficient number, since it is larger than the sum of its proper divisors (1).

13187446759681 is an equidigital number, since it uses as much as digits as its factorization.

13187446759681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243855360, while the sum is 70.

The spelling of 13187446759681 in words is "thirteen trillion, one hundred eighty-seven billion, four hundred forty-six million, seven hundred fifty-nine thousand, six hundred eighty-one".