66881334860 has 48 divisors (see below), whose sum is σ = 141746020416. Its totient is φ = 26506002432.

The previous prime is 66881334859. The next prime is 66881334901. The reversal of 66881334860 is 6843318866.

It is a super-2 number, since 2×66881334860² (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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11281217 + ... + 11287143.

It is an arithmetic number, because the mean of its divisors is an integer number (2953042092).

Almost surely, 2^66881334860 is an apocalyptic number.

It is an amenable number.

66881334860 is an abundant number, since it is smaller than the sum of its proper divisors (74864685556).

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

66881334860 is a wasteful number, since it uses less digits than its factorization.

66881334860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11042 (or 11040 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 66881334860 in words is "sixty-six billion, eight hundred eighty-one million, three hundred thirty-four thousand, eight hundred sixty".