66005106181 has 16 divisors (see below), whose sum is σ = 77222696320. Its totient is φ = 55247935680.

The previous prime is 66005106161. The next prime is 66005106229. The reversal of 66005106181 is 18160150066.

It is not a de Polignac number, because 66005106181 - 2¹¹ = 66005104133 is a prime.

It is a super-2 number, since 2×66005106181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66005106161) 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, 496686 + ... + 615391.

It is an arithmetic number, because the mean of its divisors is an integer number (4826418520).

Almost surely, 2^66005106181 is an apocalyptic number.

66005106181 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

66005106181 is a deficient number, since it is larger than the sum of its proper divisors (11217590139).

66005106181 is a wasteful number, since it uses less digits than its factorization.

66005106181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112284.

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 66005106181 in words is "sixty-six billion, five million, one hundred six thousand, one hundred eighty-one".