66667888881 has 12 divisors (see below), whose sum is σ = 105052431120. Its totient is φ = 40404781080.

The previous prime is 66667888873. The next prime is 66667888897. The reversal of 66667888881 is 18888876666.

It is not a de Polignac number, because 66667888881 - 2³ = 66667888873 is a prime.

It is a super-2 number, since 2×66667888881² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66667888841) 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 11 ways as a sum of consecutive naturals, for example, 336706411 + ... + 336706608.

It is an arithmetic number, because the mean of its divisors is an integer number (8754369260).

Almost surely, 2^66667888881 is an apocalyptic number.

It is an amenable number.

66667888881 is a deficient number, since it is larger than the sum of its proper divisors (38384542239).

66667888881 is a wasteful number, since it uses less digits than its factorization.

66667888881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673413036 (or 673413033 counting only the distinct ones).

The product of its digits is 297271296, while the sum is 72.

The spelling of 66667888881 in words is "sixty-six billion, six hundred sixty-seven million, eight hundred eighty-eight thousand, eight hundred eighty-one".