66528959488439 has 12 divisors (see below), whose sum is σ = 79887308827968. Its totient is φ = 55185312016800.

The previous prime is 66528959488427. The next prime is 66528959488513. The reversal of 66528959488439 is 93488495982566.

It is a de Polignac number, because none of the positive numbers 2^k-66528959488439 is a prime.

It is a super-2 number, since 2×66528959488439² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66528959488339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21898931822 + ... + 21898934859.

It is an arithmetic number, because the mean of its divisors is an integer number (6657275735664).

Almost surely, 2^{66528959488439} is an apocalyptic number.

66528959488439 is a deficient number, since it is larger than the sum of its proper divisors (13358349339529).

66528959488439 is a wasteful number, since it uses less digits than its factorization.

66528959488439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43797866726 (or 43797866719 counting only the distinct ones).

The product of its digits is 32248627200, while the sum is 86.

The spelling of 66528959488439 in words is "sixty-six trillion, five hundred twenty-eight billion, nine hundred fifty-nine million, four hundred eighty-eight thousand, four hundred thirty-nine".