2165055511 has 4 divisors (see below), whose sum is σ = 2166073624. Its totient is φ = 2164037400.

The previous prime is 2165055509. The next prime is 2165055533. The reversal of 2165055511 is 1155505612.

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 2165055511 - 2¹ = 2165055509 is a prime.

It is a super-2 number, since 2×2165055511² = 9374930731422942242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165055551) 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, 505860 + ... + 510121.

It is an arithmetic number, because the mean of its divisors is an integer number (541518406).

Almost surely, 2^2165055511 is an apocalyptic number.

2165055511 is a deficient number, since it is larger than the sum of its proper divisors (1018113).

2165055511 is a wasteful number, since it uses less digits than its factorization.

2165055511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018112.

The product of its (nonzero) digits is 7500, while the sum is 31.

The square root of 2165055511 is about 46530.1570059676. The cubic root of 2165055511 is about 1293.6685253024.

The spelling of 2165055511 in words is "two billion, one hundred sixty-five million, fifty-five thousand, five hundred eleven".