66171105523 has 8 divisors (see below), whose sum is σ = 67790202480. Its totient is φ = 64552254720.

The previous prime is 66171105503. The next prime is 66171105527. The reversal of 66171105523 is 32550117166.

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

It is a cyclic number.

It is not a de Polignac number, because 66171105523 - 2¹⁷ = 66170974451 is a prime.

It is a super-2 number, since 2×66171105523² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66171105527) 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, 558036 + ... + 666142.

It is an arithmetic number, because the mean of its divisors is an integer number (8473775310).

Almost surely, 2^66171105523 is an apocalyptic number.

66171105523 is a deficient number, since it is larger than the sum of its proper divisors (1619096957).

66171105523 is a wasteful number, since it uses less digits than its factorization.

66171105523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123077.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 66171105523 in words is "sixty-six billion, one hundred seventy-one million, one hundred five thousand, five hundred twenty-three".