66172193 has 8 divisors (see below), whose sum is σ = 71137920. Its totient is φ = 61354800.

The previous prime is 66172189. The next prime is 66172261. The reversal of 66172193 is 39127166.

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

It is not a de Polignac number, because 66172193 - 2² = 66172189 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66172133) 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, 36158 + ... + 37943.

It is an arithmetic number, because the mean of its divisors is an integer number (8892240).

Almost surely, 2^66172193 is an apocalyptic number.

It is an amenable number.

66172193 is a deficient number, since it is larger than the sum of its proper divisors (4965727).

66172193 is a wasteful number, since it uses less digits than its factorization.

66172193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74167.

The product of its digits is 13608, while the sum is 35.

The square root of 66172193 is about 8134.6292478514. The cubic root of 66172193 is about 404.4751479937.

The spelling of 66172193 in words is "sixty-six million, one hundred seventy-two thousand, one hundred ninety-three".