66221565432000 has 448 divisors, whose sum is σ = 238892025835008. Its totient is φ = 16030164480000.

The previous prime is 66221565431999. The next prime is 66221565432013. The reversal of 66221565432000 is 23456512266.

It is an unprimeable number.

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, 180128370 + ... + 180495630.

It is an arithmetic number, because the mean of its divisors is an integer number (533241129096).

Almost surely, 2^{66221565432000} is an apocalyptic number.

66221565432000 is a gapful number since it is divisible by the number (60) 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 66221565432000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119446012917504).

66221565432000 is an abundant number, since it is smaller than the sum of its proper divisors (172670460403008).

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

66221565432000 is a wasteful number, since it uses less digits than its factorization.

66221565432000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367985 (or 367965 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 66221565432000 in words is "sixty-six trillion, two hundred twenty-one billion, five hundred sixty-five million, four hundred thirty-two thousand".