66907223424 has 256 divisors, whose sum is σ = 203345568000. Its totient is φ = 21918988800.

The previous prime is 66907223417. The next prime is 66907223507. The reversal of 66907223424 is 42432270966.

It is a self number, because there is not a number n which added to its sum of digits gives 66907223424.

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, 16514199 + ... + 16518249.

It is an arithmetic number, because the mean of its divisors is an integer number (794318625).

Almost surely, 2^66907223424 is an apocalyptic number.

66907223424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66907223424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101672784000).

66907223424 is an abundant number, since it is smaller than the sum of its proper divisors (136438344576).

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

66907223424 is an frugal number, since it uses more digits than its factorization.

66907223424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4145 (or 4115 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 45.

The spelling of 66907223424 in words is "sixty-six billion, nine hundred seven million, two hundred twenty-three thousand, four hundred twenty-four".