66608621532 has 144 divisors (see below), whose sum is σ = 174243363840. Its totient is φ = 21443520384.

The previous prime is 66608621531. The next prime is 66608621557. The reversal of 66608621532 is 23512680666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66608621531) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97523263 + ... + 97523945.

It is an arithmetic number, because the mean of its divisors is an integer number (1210023360).

Almost surely, 2^66608621532 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66608621532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87121681920).

66608621532 is an abundant number, since it is smaller than the sum of its proper divisors (107634742308).

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

66608621532 is a wasteful number, since it uses less digits than its factorization.

66608621532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472 (or 1467 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 66608621532 in words is "sixty-six billion, six hundred eight million, six hundred twenty-one thousand, five hundred thirty-two".