66181371 has 8 divisors (see below), whose sum is σ = 88281600. Its totient is φ = 44101032.

The previous prime is 66181363. The next prime is 66181387. The reversal of 66181371 is 17318166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66181371 - 2³ = 66181363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66181321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6730 + ... + 13328.

It is an arithmetic number, because the mean of its divisors is an integer number (11035200).

Almost surely, 2^66181371 is an apocalyptic number.

66181371 is a deficient number, since it is larger than the sum of its proper divisors (22100229).

66181371 is a wasteful number, since it uses less digits than its factorization.

66181371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9945.

The product of its digits is 6048, while the sum is 33.

The square root of 66181371 is about 8135.1933597180. The cubic root of 66181371 is about 404.4938471941.

The spelling of 66181371 in words is "sixty-six million, one hundred eighty-one thousand, three hundred seventy-one".