66532229877888 has 640 divisors, whose sum is σ = 204563022048000. Its totient is φ = 21454658224128.

The previous prime is 66532229877887. The next prime is 66532229877899. The reversal of 66532229877888 is 88877892223566.

66532229877888 is a `hidden beast` number, since 6 + 6 + 532 + 2 + 2 + 9 + 8 + 7 + 78 + 8 + 8 = 666.

It is a super-2 number, since 2×66532229877888² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (66532229877881) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 15090093028 + ... + 15090097436.

It is an arithmetic number, because the mean of its divisors is an integer number (319629721950).

Almost surely, 2^{66532229877888} 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 66532229877888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102281511024000).

66532229877888 is an abundant number, since it is smaller than the sum of its proper divisors (138030792170112).

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

66532229877888 is a wasteful number, since it uses less digits than its factorization.

66532229877888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4834 (or 4813 counting only the distinct ones).

The product of its digits is 7803371520, while the sum is 81.

The spelling of 66532229877888 in words is "sixty-six trillion, five hundred thirty-two billion, two hundred twenty-nine million, eight hundred seventy-seven thousand, eight hundred eighty-eight".