66172645368 has 24 divisors (see below), whose sum is σ = 179217581400. Its totient is φ = 22057548432.

The previous prime is 66172645337. The next prime is 66172645369. The reversal of 66172645368 is 86354627166.

66172645368 is a `hidden beast` number, since 6 + 6 + 17 + 264 + 5 + 368 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66172645369) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 459532188 + ... + 459532331.

It is an arithmetic number, because the mean of its divisors is an integer number (7467399225).

Almost surely, 2^66172645368 is an apocalyptic number.

It is an amenable number.

66172645368 is an abundant number, since it is smaller than the sum of its proper divisors (113044936032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66172645368 is a wasteful number, since it uses less digits than its factorization.

66172645368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919064531 (or 919064524 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The spelling of 66172645368 in words is "sixty-six billion, one hundred seventy-two million, six hundred forty-five thousand, three hundred sixty-eight".