7111571121161 has 4 divisors (see below), whose sum is σ = 7658615053572. Its totient is φ = 6564527188752.

The previous prime is 7111571121143. The next prime is 7111571121197. The reversal of 7111571121161 is 1611211751117.

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 1622770254400 + 5488800866761 = 1273880^2 + 2342819^2 .

It is not a de Polignac number, because 7111571121161 - 2¹⁴ = 7111571104777 is a prime.

It is a super-2 number, since 2×7111571121161² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7111571121961) 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, 273521966186 + ... + 273521966211.

It is an arithmetic number, because the mean of its divisors is an integer number (1914653763393).

Almost surely, 2^{7111571121161} is an apocalyptic number.

It is an amenable number.

7111571121161 is a deficient number, since it is larger than the sum of its proper divisors (547043932411).

7111571121161 is a wasteful number, since it uses less digits than its factorization.

7111571121161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547043932410.

The product of its digits is 2940, while the sum is 35.

Adding to 7111571121161 its reverse (1611211751117), we get a palindrome (8722782872278).

The spelling of 7111571121161 in words is "seven trillion, one hundred eleven billion, five hundred seventy-one million, one hundred twenty-one thousand, one hundred sixty-one".