2166111070161 has 32 divisors (see below), whose sum is σ = 2979967536000. Its totient is φ = 1398682974720.

The previous prime is 2166111070153. The next prime is 2166111070187. The reversal of 2166111070161 is 1610701116612.

It is a happy number.

It is not a de Polignac number, because 2166111070161 - 2³ = 2166111070153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166111070261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37119675 + ... + 37177983.

It is an arithmetic number, because the mean of its divisors is an integer number (93123985500).

Almost surely, 2^{2166111070161} is an apocalyptic number.

It is an amenable number.

2166111070161 is a deficient number, since it is larger than the sum of its proper divisors (813856465839).

2166111070161 is a wasteful number, since it uses less digits than its factorization.

2166111070161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60529.

The product of its (nonzero) digits is 3024, while the sum is 33.

Adding to 2166111070161 its reverse (1610701116612), we get a palindrome (3776812186773).

The spelling of 2166111070161 in words is "two trillion, one hundred sixty-six billion, one hundred eleven million, seventy thousand, one hundred sixty-one".