51606165 has 32 divisors (see below), whose sum is σ = 91800576. Its totient is φ = 24583680.

The previous prime is 51606161. The next prime is 51606199. The reversal of 51606165 is 56160615.

51606165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51606165 - 2² = 51606161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51606161) 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 31 ways as a sum of consecutive naturals, for example, 1777 + ... + 10313.

It is an arithmetic number, because the mean of its divisors is an integer number (2868768).

Almost surely, 2^51606165 is an apocalyptic number.

It is an amenable number.

51606165 is a deficient number, since it is larger than the sum of its proper divisors (40194411).

51606165 is a wasteful number, since it uses less digits than its factorization.

51606165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8589.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 51606165 is about 7183.7431050950. The cubic root of 51606165 is about 372.3064231516.

It can be divided in two parts, 5160 and 6165, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 51606165 in words is "fifty-one million, six hundred six thousand, one hundred sixty-five".