11711507156161 has 4 divisors (see below), whose sum is σ = 11779203729492. Its totient is φ = 11643810582832.

The previous prime is 11711507156147. The next prime is 11711507156171. The reversal of 11711507156161 is 16165170511711.

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 10442876623936 + 1268630532225 = 3231544^2 + 1126335^2 .

It is a cyclic number.

It is not a de Polignac number, because 11711507156161 - 2³⁷ = 11574068202689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11711507156171) 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, 33848286406 + ... + 33848286751.

It is an arithmetic number, because the mean of its divisors is an integer number (2944800932373).

Almost surely, 2^{11711507156161} is an apocalyptic number.

It is an amenable number.

11711507156161 is a deficient number, since it is larger than the sum of its proper divisors (67696573331).

11711507156161 is an equidigital number, since it uses as much as digits as its factorization.

11711507156161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67696573330.

The product of its (nonzero) digits is 44100, while the sum is 43.

Adding to 11711507156161 its reverse (16165170511711), we get a palindrome (27876677667872).

The spelling of 11711507156161 in words is "eleven trillion, seven hundred eleven billion, five hundred seven million, one hundred fifty-six thousand, one hundred sixty-one".