66171065886 has 32 divisors (see below), whose sum is σ = 147113287200. Its totient is φ = 22047050880.

The previous prime is 66171065867. The next prime is 66171065929. The reversal of 66171065886 is 68856017166.

66171065886 is a `hidden beast` number, since 6 + 617 + 10 + 6 + 5 + 8 + 8 + 6 = 666.

66171065886 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155931 + ... + 395798.

It is an arithmetic number, because the mean of its divisors is an integer number (4597290225).

Almost surely, 2^66171065886 is an apocalyptic number.

66171065886 is an abundant number, since it is smaller than the sum of its proper divisors (80942221314).

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

66171065886 is a wasteful number, since it uses less digits than its factorization.

66171065886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553961 (or 553955 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 66171065886 in words is "sixty-six billion, one hundred seventy-one million, sixty-five thousand, eight hundred eighty-six".