116661161 has 4 divisors (see below), whose sum is σ = 117816324. Its totient is φ = 115506000.

The previous prime is 116661131. The next prime is 116661179. The reversal of 116661161 is 161166611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161166611 = 1283 ⋅125617.

It can be written as a sum of positive squares in 2 ways, for example, as 65108761 + 51552400 = 8069^2 + 7180^2 .

It is a cyclic number.

It is not a de Polignac number, because 116661161 - 2¹⁴ = 116644777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (116661101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577430 + ... + 577631.

It is an arithmetic number, because the mean of its divisors is an integer number (29454081).

Almost surely, 2^116661161 is an apocalyptic number.

It is an amenable number.

116661161 is a deficient number, since it is larger than the sum of its proper divisors (1155163).

116661161 is a wasteful number, since it uses less digits than its factorization.

116661161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155162.

The product of its digits is 1296, while the sum is 29.

The square root of 116661161 is about 10800.9796314964. The cubic root of 116661161 is about 488.6247164181.

The spelling of 116661161 in words is "one hundred sixteen million, six hundred sixty-one thousand, one hundred sixty-one".