66881334868 has 12 divisors (see below), whose sum is σ = 117963930112. Its totient is φ = 33177354840.

The previous prime is 66881334859. The next prime is 66881334901. The reversal of 66881334868 is 86843318866.

It is a super-2 number, since 2×66881334868² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65827578 + ... + 65828593.

Almost surely, 2^66881334868 is an apocalyptic number.

It is an amenable number.

66881334868 is a deficient number, since it is larger than the sum of its proper divisors (51082595244).

66881334868 is a wasteful number, since it uses less digits than its factorization.

66881334868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131656302 (or 131656300 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 61.

The spelling of 66881334868 in words is "sixty-six billion, eight hundred eighty-one million, three hundred thirty-four thousand, eight hundred sixty-eight".