15487587344521 has 2 divisors, whose sum is σ = 15487587344522. Its totient is φ = 15487587344520.

The previous prime is 15487587344519. The next prime is 15487587344549. The reversal of 15487587344521 is 12544378578451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9385644960000 + 6101942384521 = 3063600^2 + 2470211^2 .

It is an emirp because it is prime and its reverse (12544378578451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15487587344521 - 2¹ = 15487587344519 is a prime.

Together with 15487587344519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15487587044521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7743793672260 + 7743793672261.

It is an arithmetic number, because the mean of its divisors is an integer number (7743793672261).

Almost surely, 2^{15487587344521} is an apocalyptic number.

It is an amenable number.

15487587344521 is a deficient number, since it is larger than the sum of its proper divisors (1).

15487587344521 is an equidigital number, since it uses as much as digits as its factorization.

15487587344521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 150528000, while the sum is 64.

The spelling of 15487587344521 in words is "fifteen trillion, four hundred eighty-seven billion, five hundred eighty-seven million, three hundred forty-four thousand, five hundred twenty-one".