2166705161 has 8 divisors (see below), whose sum is σ = 2219226240. Its totient is φ = 2114777808.

The previous prime is 2166705157. The next prime is 2166705169. The reversal of 2166705161 is 1615076612.

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

It is a cyclic number.

It is not a de Polignac number, because 2166705161 - 2² = 2166705157 is a prime.

It is a super-2 number, since 2×2166705161² = 9389222509408071842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166705169) 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, 141041 + ... + 155646.

It is an arithmetic number, because the mean of its divisors is an integer number (277403280).

Almost surely, 2^2166705161 is an apocalyptic number.

It is an amenable number.

2166705161 is a deficient number, since it is larger than the sum of its proper divisors (52521079).

2166705161 is a wasteful number, since it uses less digits than its factorization.

2166705161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296863.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 2166705161 is about 46547.8803061965. The cubic root of 2166705161 is about 1293.9970093343.

The spelling of 2166705161 in words is "two billion, one hundred sixty-six million, seven hundred five thousand, one hundred sixty-one".