66474847881 has 16 divisors (see below), whose sum is σ = 106056737920. Its totient is φ = 40907598480.

The previous prime is 66474847877. The next prime is 66474847913. The reversal of 66474847881 is 18874847466.

66474847881 is a `hidden beast` number, since 6 + 6 + 4 + 7 + 484 + 78 + 81 = 666.

It is not a de Polignac number, because 66474847881 - 2² = 66474847877 is a prime.

It is a super-3 number, since 3×66474847881³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66474847811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94693165 + ... + 94693866.

It is an arithmetic number, because the mean of its divisors is an integer number (6628546120).

Almost surely, 2^66474847881 is an apocalyptic number.

It is an amenable number.

66474847881 is a deficient number, since it is larger than the sum of its proper divisors (39581890039).

66474847881 is a wasteful number, since it uses less digits than its factorization.

66474847881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189387053 (or 189387047 counting only the distinct ones).

The product of its digits is 57802752, while the sum is 63.

The spelling of 66474847881 in words is "sixty-six billion, four hundred seventy-four million, eight hundred forty-seven thousand, eight hundred eighty-one".