66172571153 has 16 divisors (see below), whose sum is σ = 76370923776. Its totient is φ = 56847510720.

The previous prime is 66172571099. The next prime is 66172571167. The reversal of 66172571153 is 35117527166.

It is a happy number.

It is not a de Polignac number, because 66172571153 - 2⁸ = 66172570897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66172571953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2979653 + ... + 3001778.

It is an arithmetic number, because the mean of its divisors is an integer number (4773182736).

Almost surely, 2^66172571153 is an apocalyptic number.

It is an amenable number.

66172571153 is a deficient number, since it is larger than the sum of its proper divisors (10198352623).

66172571153 is a wasteful number, since it uses less digits than its factorization.

66172571153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5981504.

The product of its digits is 264600, while the sum is 44.

The spelling of 66172571153 in words is "sixty-six billion, one hundred seventy-two million, five hundred seventy-one thousand, one hundred fifty-three".