66616232173 has 16 divisors (see below), whose sum is σ = 68174472960. Its totient is φ = 65069798976.

The previous prime is 66616232171. The next prime is 66616232197. The reversal of 66616232173 is 37123261666.

It is a cyclic number.

It is not a de Polignac number, because 66616232173 - 2¹ = 66616232171 is a prime.

It is a super-3 number, since 3×66616232173³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66616232171) 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 15 ways as a sum of consecutive naturals, for example, 12815611 + ... + 12820807.

It is an arithmetic number, because the mean of its divisors is an integer number (4260904560).

Almost surely, 2^66616232173 is an apocalyptic number.

It is an amenable number.

66616232173 is a deficient number, since it is larger than the sum of its proper divisors (1558240787).

66616232173 is a wasteful number, since it uses less digits than its factorization.

66616232173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6276.

The product of its digits is 326592, while the sum is 43.

The spelling of 66616232173 in words is "sixty-six billion, six hundred sixteen million, two hundred thirty-two thousand, one hundred seventy-three".