2661665163 has 8 divisors (see below), whose sum is σ = 3757645008. Its totient is φ = 1670064384.

The previous prime is 2661665143. The next prime is 2661665173. The reversal of 2661665163 is 3615661662.

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

It is not a de Polignac number, because 2661665163 - 2¹⁰ = 2661664139 is a prime.

It is a super-2 number, since 2×2661665163² = 14168922879855633138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2661665113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26094706 + ... + 26094807.

It is an arithmetic number, because the mean of its divisors is an integer number (469705626).

Almost surely, 2^2661665163 is an apocalyptic number.

2661665163 is a deficient number, since it is larger than the sum of its proper divisors (1095979845).

2661665163 is a wasteful number, since it uses less digits than its factorization.

2661665163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52189533.

The product of its digits is 233280, while the sum is 42.

The square root of 2661665163 is about 51591.3283701825. The cubic root of 2661665163 is about 1385.8550438824.

The spelling of 2661665163 in words is "two billion, six hundred sixty-one million, six hundred sixty-five thousand, one hundred sixty-three".