66669804432 has 320 divisors, whose sum is σ = 239941785600. Its totient is φ = 17218552320.

The previous prime is 66669804413. The next prime is 66669804437. The reversal of 66669804432 is 23440896666.

It is a super-2 number, since 2×66669804432² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (66669804437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5948658 + ... + 5959854.

It is an arithmetic number, because the mean of its divisors is an integer number (749818080).

Almost surely, 2^66669804432 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 66669804432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119970892800).

66669804432 is an abundant number, since it is smaller than the sum of its proper divisors (173271981168).

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

66669804432 is a wasteful number, since it uses less digits than its factorization.

66669804432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11411 (or 11399 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 54.

The spelling of 66669804432 in words is "sixty-six billion, six hundred sixty-nine million, eight hundred four thousand, four hundred thirty-two".