51665204 has 12 divisors (see below), whose sum is σ = 90483204. Its totient is φ = 25812864.

The previous prime is 51665203. The next prime is 51665219. The reversal of 51665204 is 40256615.

It can be written as a sum of positive squares in 2 ways, for example, as 30780304 + 20884900 = 5548^2 + 4570^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2054 + ... + 10370.

It is an arithmetic number, because the mean of its divisors is an integer number (7540267).

Almost surely, 2^51665204 is an apocalyptic number.

It is an amenable number.

51665204 is a deficient number, since it is larger than the sum of its proper divisors (38818000).

51665204 is a wasteful number, since it uses less digits than its factorization.

51665204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9874 (or 9872 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 51665204 is about 7187.8511392488. The cubic root of 51665204 is about 372.4483456143.

The spelling of 51665204 in words is "fifty-one million, six hundred sixty-five thousand, two hundred four".