2165006511 has 12 divisors (see below), whose sum is σ = 3135620488. Its totient is φ = 1439465904.

The previous prime is 2165006497. The next prime is 2165006531. The reversal of 2165006511 is 1156005612.

It is a happy number.

2165006511 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 0 + 0 + 651 + 1 = 666.

It is not a de Polignac number, because 2165006511 - 2⁶ = 2165006447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165006531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319105 + ... + 325818.

Almost surely, 2^2165006511 is an apocalyptic number.

2165006511 is a deficient number, since it is larger than the sum of its proper divisors (970613977).

2165006511 is a wasteful number, since it uses less digits than its factorization.

2165006511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645302 (or 645299 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 2165006511 is about 46529.6304627492. The cubic root of 2165006511 is about 1293.6587657011.

The spelling of 2165006511 in words is "two billion, one hundred sixty-five million, six thousand, five hundred eleven".