66172311 has 12 divisors (see below), whose sum is σ = 99738288. Its totient is φ = 42196704.

The previous prime is 66172291. The next prime is 66172361. The reversal of 66172311 is 11327166.

It is not a de Polignac number, because 66172311 - 2¹⁴ = 66155927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66172361) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 159630 + ... + 160043.

It is an arithmetic number, because the mean of its divisors is an integer number (8311524).

Almost surely, 2^66172311 is an apocalyptic number.

66172311 is a deficient number, since it is larger than the sum of its proper divisors (33565977).

66172311 is a wasteful number, since it uses less digits than its factorization.

66172311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319702 (or 319699 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 66172311 is about 8134.6365007909. The cubic root of 66172311 is about 404.4753884171.

Adding to 66172311 its reverse (11327166), we get a palindrome (77499477).

The spelling of 66172311 in words is "sixty-six million, one hundred seventy-two thousand, three hundred eleven".