1166172665 has 16 divisors (see below), whose sum is σ = 1601392512. Its totient is φ = 798626304.

The previous prime is 1166172643. The next prime is 1166172673. The reversal of 1166172665 is 5662716611.

It is not a de Polignac number, because 1166172665 - 2¹² = 1166168569 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6377 + ... + 48713.

It is an arithmetic number, because the mean of its divisors is an integer number (100087032).

Almost surely, 2^1166172665 is an apocalyptic number.

It is an amenable number.

1166172665 is a deficient number, since it is larger than the sum of its proper divisors (435219847).

1166172665 is an equidigital number, since it uses as much as digits as its factorization.

1166172665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43136.

The product of its digits is 90720, while the sum is 41.

The square root of 1166172665 is about 34149.2703435959. The cubic root of 1166172665 is about 1052.5779932913.

The spelling of 1166172665 in words is "one billion, one hundred sixty-six million, one hundred seventy-two thousand, six hundred sixty-five".