11616665161 has 4 divisors (see below), whose sum is σ = 11621473812. Its totient is φ = 11611856512.

The previous prime is 11616665149. The next prime is 11616665167. The reversal of 11616665161 is 16156661611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16156661611 = 101323 ⋅159457.

It can be written as a sum of positive squares in 2 ways, for example, as 11504707600 + 111957561 = 107260^2 + 10581^2 .

It is a cyclic number.

It is not a de Polignac number, because 11616665161 - 2⁷ = 11616665033 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11616665167) 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, 2400700 + ... + 2405533.

It is an arithmetic number, because the mean of its divisors is an integer number (2905368453).

Almost surely, 2^11616665161 is an apocalyptic number.

It is an amenable number.

11616665161 is a deficient number, since it is larger than the sum of its proper divisors (4808651).

11616665161 is an equidigital number, since it uses as much as digits as its factorization.

11616665161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4808650.

The product of its digits is 38880, while the sum is 40.

The spelling of 11616665161 in words is "eleven billion, six hundred sixteen million, six hundred sixty-five thousand, one hundred sixty-one".