16091538553481 has 2 divisors, whose sum is σ = 16091538553482. Its totient is φ = 16091538553480.

The previous prime is 16091538553369. The next prime is 16091538553507. The reversal of 16091538553481 is 18435583519061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14985221655625 + 1106316897856 = 3871075^2 + 1051816^2 .

It is a cyclic number.

It is not a de Polignac number, because 16091538553481 - 2²² = 16091534359177 is a prime.

It is a super-2 number, since 2×16091538553481² (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 16091538553481.

It is not a weakly prime, because it can be changed into another prime (16091538550481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8045769276740 + 8045769276741.

It is an arithmetic number, because the mean of its divisors is an integer number (8045769276741).

Almost surely, 2^{16091538553481} is an apocalyptic number.

It is an amenable number.

16091538553481 is a deficient number, since it is larger than the sum of its proper divisors (1).

16091538553481 is an equidigital number, since it uses as much as digits as its factorization.

16091538553481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552000, while the sum is 59.

The spelling of 16091538553481 in words is "sixteen trillion, ninety-one billion, five hundred thirty-eight million, five hundred fifty-three thousand, four hundred eighty-one".