51665365 has 8 divisors (see below), whose sum is σ = 62037720. Its totient is φ = 41306112.

The previous prime is 51665359. The next prime is 51665387. The reversal of 51665365 is 56356615.

It is a happy number.

51665365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12552849 + 39112516 = 3543^2 + 6254^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51665365 - 2⁵ = 51665333 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11341 + ... + 15229.

It is an arithmetic number, because the mean of its divisors is an integer number (7754715).

Almost surely, 2^51665365 is an apocalyptic number.

It is an amenable number.

51665365 is a deficient number, since it is larger than the sum of its proper divisors (10372355).

51665365 is a wasteful number, since it uses less digits than its factorization.

51665365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6551.

The product of its digits is 81000, while the sum is 37.

The square root of 51665365 is about 7187.8623386929. The cubic root of 51665365 is about 372.4487324906.

The spelling of 51665365 in words is "fifty-one million, six hundred sixty-five thousand, three hundred sixty-five".