66013503171 has 64 divisors (see below), whose sum is σ = 111213096960. Its totient is φ = 33834464640.

The previous prime is 66013503169. The next prime is 66013503181. The reversal of 66013503171 is 17130531066.

It is a happy number.

It is not a de Polignac number, because 66013503171 - 2¹ = 66013503169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (66013503181) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5227461 + ... + 5240073.

It is an arithmetic number, because the mean of its divisors is an integer number (1737704640).

Almost surely, 2^66013503171 is an apocalyptic number.

66013503171 is a deficient number, since it is larger than the sum of its proper divisors (45199593789).

66013503171 is a wasteful number, since it uses less digits than its factorization.

66013503171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12936.

The product of its (nonzero) digits is 11340, while the sum is 33.

The spelling of 66013503171 in words is "sixty-six billion, thirteen million, five hundred three thousand, one hundred seventy-one".