66528959488513 has 2 divisors, whose sum is σ = 66528959488514. Its totient is φ = 66528959488512.

The previous prime is 66528959488427. The next prime is 66528959488543. The reversal of 66528959488513 is 31588495982566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51054554691009 + 15474404797504 = 7145247^2 + 3933752^2 .

It is a cyclic number.

It is not a de Polignac number, because 66528959488513 - 2²¹ = 66528957391361 is a prime.

It is a super-2 number, since 2×66528959488513² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66528959488543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33264479744256 + 33264479744257.

It is an arithmetic number, because the mean of its divisors is an integer number (33264479744257).

Almost surely, 2^{66528959488513} is an apocalyptic number.

It is an amenable number.

66528959488513 is a deficient number, since it is larger than the sum of its proper divisors (1).

66528959488513 is an equidigital number, since it uses as much as digits as its factorization.

66528959488513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976000, while the sum is 79.

The spelling of 66528959488513 in words is "sixty-six trillion, five hundred twenty-eight billion, nine hundred fifty-nine million, four hundred eighty-eight thousand, five hundred thirteen".