51665732 has 6 divisors (see below), whose sum is σ = 90415038. Its totient is φ = 25832864.

The previous prime is 51665723. The next prime is 51665741. The reversal of 51665732 is 23756615.

It is an interprime number because it is at equal distance from previous prime (51665723) and next prime (51665741).

It can be written as a sum of positive squares in only one way, i.e., 31181056 + 20484676 = 5584^2 + 4526^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51665692 and 51665701.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6458213 + ... + 6458220.

It is an arithmetic number, because the mean of its divisors is an integer number (15069173).

Almost surely, 2^51665732 is an apocalyptic number.

It is an amenable number.

51665732 is a deficient number, since it is larger than the sum of its proper divisors (38749306).

51665732 is a wasteful number, since it uses less digits than its factorization.

51665732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12916437 (or 12916435 counting only the distinct ones).

The product of its digits is 37800, while the sum is 35.

The square root of 51665732 is about 7187.8878677954. The cubic root of 51665732 is about 372.4496143732.

The spelling of 51665732 in words is "fifty-one million, six hundred sixty-five thousand, seven hundred thirty-two".