66329731832 has 128 divisors (see below), whose sum is σ = 159891701760. Its totient is φ = 25073072640.

The previous prime is 66329731807. The next prime is 66329731859. The reversal of 66329731832 is 23813792366.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24629078 + ... + 24631770.

It is an arithmetic number, because the mean of its divisors is an integer number (1249153920).

Almost surely, 2^66329731832 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 66329731832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79945850880).

66329731832 is an abundant number, since it is smaller than the sum of its proper divisors (93561969928).

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

66329731832 is a wasteful number, since it uses less digits than its factorization.

66329731832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4213 (or 4209 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 50.

The spelling of 66329731832 in words is "sixty-six billion, three hundred twenty-nine million, seven hundred thirty-one thousand, eight hundred thirty-two".