66691845024 has 192 divisors, whose sum is σ = 203575680000. Its totient is φ = 18722930688.

The previous prime is 66691845013. The next prime is 66691845029. The reversal of 66691845024 is 42054819666.

It is not an unprimeable number, because it can be changed into a prime (66691845029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20214127 + ... + 20217425.

It is an arithmetic number, because the mean of its divisors is an integer number (1060290000).

Almost surely, 2^66691845024 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 66691845024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101787840000).

66691845024 is an abundant number, since it is smaller than the sum of its proper divisors (136883834976).

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

66691845024 is a wasteful number, since it uses less digits than its factorization.

66691845024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3835 (or 3827 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 66691845024 in words is "sixty-six billion, six hundred ninety-one million, eight hundred forty-five thousand, twenty-four".