16616111161 has 8 divisors (see below), whose sum is σ = 17955350280. Its totient is φ = 15285597312.

The previous prime is 16616111147. The next prime is 16616111203. The reversal of 16616111161 is 16111161661.

It can be written as a sum of positive squares in 4 ways, for example, as 7888814761 + 8727296400 = 88819^2 + 93420^2 .

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 16616111161 - 2⁷ = 16616111033 is a prime.

It is a super-2 number, since 2×16616111161² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16616111131) 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, 2177356 + ... + 2184973.

It is an arithmetic number, because the mean of its divisors is an integer number (2244418785).

Almost surely, 2^16616111161 is an apocalyptic number.

It is an amenable number.

16616111161 is a deficient number, since it is larger than the sum of its proper divisors (1339239119).

16616111161 is a wasteful number, since it uses less digits than its factorization.

16616111161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4362635.

The product of its digits is 1296, while the sum is 31.

The spelling of 16616111161 in words is "sixteen billion, six hundred sixteen million, one hundred eleven thousand, one hundred sixty-one".