66877582128 has 80 divisors (see below), whose sum is σ = 197742153216. Its totient is φ = 19079424000.

The previous prime is 66877582069. The next prime is 66877582133. The reversal of 66877582128 is 82128577866.

It is a super-2 number, since 2×66877582128² (a number of 22 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 78253 + ... + 374003.

Almost surely, 2^66877582128 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 66877582128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98871076608).

66877582128 is an abundant number, since it is smaller than the sum of its proper divisors (130864571088).

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

66877582128 is a wasteful number, since it uses less digits than its factorization.

66877582128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296442 (or 296436 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 60.

The spelling of 66877582128 in words is "sixty-six billion, eight hundred seventy-seven million, five hundred eighty-two thousand, one hundred twenty-eight".