2161126065511 has 4 divisors (see below), whose sum is σ = 2469858360592. Its totient is φ = 1852393770432.

The previous prime is 2161126065493. The next prime is 2161126065517. The reversal of 2161126065511 is 1155606211612.

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

It is a cyclic number.

It is not a de Polignac number, because 2161126065511 - 2⁷ = 2161126065383 is a prime.

It is a super-2 number, since 2×2161126065511² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161126065517) 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, 154366147530 + ... + 154366147543.

It is an arithmetic number, because the mean of its divisors is an integer number (617464590148).

Almost surely, 2^{2161126065511} is an apocalyptic number.

2161126065511 is a deficient number, since it is larger than the sum of its proper divisors (308732295081).

2161126065511 is an equidigital number, since it uses as much as digits as its factorization.

2161126065511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308732295080.

The product of its (nonzero) digits is 21600, while the sum is 37.

The spelling of 2161126065511 in words is "two trillion, one hundred sixty-one billion, one hundred twenty-six million, sixty-five thousand, five hundred eleven".