13887527515261 has 2 divisors, whose sum is σ = 13887527515262. Its totient is φ = 13887527515260.

The previous prime is 13887527515247. The next prime is 13887527515271. The reversal of 13887527515261 is 16251572578831.

13887527515261 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., 13189644380025 + 697883135236 = 3631755^2 + 835394^2 .

It is an emirp because it is prime and its reverse (16251572578831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13887527515261 - 2²⁹ = 13886990644349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13887527515261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13887527515201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6943763757630 + 6943763757631.

It is an arithmetic number, because the mean of its divisors is an integer number (6943763757631).

Almost surely, 2^{13887527515261} is an apocalyptic number.

It is an amenable number.

13887527515261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13887527515261 is an equidigital number, since it uses as much as digits as its factorization.

13887527515261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224000, while the sum is 61.

The spelling of 13887527515261 in words is "thirteen trillion, eight hundred eighty-seven billion, five hundred twenty-seven million, five hundred fifteen thousand, two hundred sixty-one".