66222172162165 has 8 divisors (see below), whose sum is σ = 79472857485528. Its totient is φ = 52973570469120.

The previous prime is 66222172162121. The next prime is 66222172162177. The reversal of 66222172162165 is 56126127122266.

It can be written as a sum of positive squares in 4 ways, for example, as 34009634641284 + 32212537520881 = 5831778^2 + 5675609^2 .

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

It is not a de Polignac number, because 66222172162165 - 2⁷ = 66222172162037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 520837656 + ... + 520964785.

It is an arithmetic number, because the mean of its divisors is an integer number (9934107185691).

Almost surely, 2^{66222172162165} is an apocalyptic number.

It is an amenable number.

66222172162165 is a deficient number, since it is larger than the sum of its proper divisors (13250685323363).

66222172162165 is a wasteful number, since it uses less digits than its factorization.

66222172162165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041815159.

The product of its digits is 1451520, while the sum is 49.

The spelling of 66222172162165 in words is "sixty-six trillion, two hundred twenty-two billion, one hundred seventy-two million, one hundred sixty-two thousand, one hundred sixty-five".