11551516545497 has 2 divisors, whose sum is σ = 11551516545498. Its totient is φ = 11551516545496.

The previous prime is 11551516545493. The next prime is 11551516545529. The reversal of 11551516545497 is 79454561515511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9019786863616 + 2531729681881 = 3003296^2 + 1591141^2 .

It is a cyclic number.

It is not a de Polignac number, because 11551516545497 - 2² = 11551516545493 is a prime.

It is not a weakly prime, because it can be changed into another prime (11551516545493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775758272748 + 5775758272749.

It is an arithmetic number, because the mean of its divisors is an integer number (5775758272749).

Almost surely, 2^{11551516545497} is an apocalyptic number.

It is an amenable number.

11551516545497 is a deficient number, since it is larger than the sum of its proper divisors (1).

11551516545497 is an equidigital number, since it uses as much as digits as its factorization.

11551516545497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900000, while the sum is 59.

The spelling of 11551516545497 in words is "eleven trillion, five hundred fifty-one billion, five hundred sixteen million, five hundred forty-five thousand, four hundred ninety-seven".