51665502 has 48 divisors (see below), whose sum is σ = 122791680. Its totient is φ = 14443632.

The previous prime is 51665473. The next prime is 51665507. The reversal of 51665502 is 20556615.

51665502 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51665502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665507) 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 23 ways as a sum of consecutive naturals, for example, 11949 + ... + 15687.

It is an arithmetic number, because the mean of its divisors is an integer number (2558160).

Almost surely, 2^51665502 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51665502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61395840).

51665502 is an abundant number, since it is smaller than the sum of its proper divisors (71126178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51665502 is a wasteful number, since it uses less digits than its factorization.

51665502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3805 (or 3798 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 51665502 is about 7187.8718686410. The cubic root of 51665502 is about 372.4490616952.

The spelling of 51665502 in words is "fifty-one million, six hundred sixty-five thousand, five hundred two".