1611100011161 has 4 divisors (see below), whose sum is σ = 1611114063972. Its totient is φ = 1611085958352.

The previous prime is 1611100011137. The next prime is 1611100011187.

1611100011161 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1550475722761 + 60624288400 = 1245181^2 + 246220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611100011161 - 2⁶ = 1611100011097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1611100017161) 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, 6853010 + ... + 7084203.

It is an arithmetic number, because the mean of its divisors is an integer number (402778515993).

Almost surely, 2^{1611100011161} is an apocalyptic number.

It is an amenable number.

1611100011161 is a deficient number, since it is larger than the sum of its proper divisors (14052811).

1611100011161 is a wasteful number, since it uses less digits than its factorization.

1611100011161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14052810.

The product of its (nonzero) digits is 36, while the sum is 20.

It can be divided in two parts, 16111000 and 11161, that added together give a palindrome (16122161).

The spelling of 1611100011161 in words is "one trillion, six hundred eleven billion, one hundred million, eleven thousand, one hundred sixty-one".