66528959488440 has 64 divisors (see below), whose sum is σ = 201353134068000. Its totient is φ = 17584055365632.

The previous prime is 66528959488427. The next prime is 66528959488513. The reversal of 66528959488440 is 4488495982566.

It is a super-2 number, since 2×66528959488440² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2453119165 + ... + 2453146284.

Almost surely, 2^{66528959488440} is an apocalyptic number.

66528959488440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66528959488440 is an abundant number, since it is smaller than the sum of its proper divisors (134824174579560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66528959488440 is a wasteful number, since it uses less digits than its factorization.

66528959488440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4906265576 (or 4906265572 counting only the distinct ones).

The product of its (nonzero) digits is 4777574400, while the sum is 78.

The spelling of 66528959488440 in words is "sixty-six trillion, five hundred twenty-eight billion, nine hundred fifty-nine million, four hundred eighty-eight thousand, four hundred forty".