51957665 has 8 divisors (see below), whose sum is σ = 63371688. Its totient is φ = 40884480.

The previous prime is 51957623. The next prime is 51957691. The reversal of 51957665 is 56675915.

51957665 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 2401 + 51955264 = 49^2 + 7208^2 .

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

It is not a de Polignac number, because 51957665 - 2²² = 47763361 is a prime.

It is a Duffinian 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, 84872 + ... + 85481.

It is an arithmetic number, because the mean of its divisors is an integer number (7921461).

Almost surely, 2^51957665 is an apocalyptic number.

It is an amenable number.

51957665 is a deficient number, since it is larger than the sum of its proper divisors (11414023).

51957665 is a wasteful number, since it uses less digits than its factorization.

51957665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170419.

The product of its digits is 283500, while the sum is 44.

The square root of 51957665 is about 7208.1665491302. The cubic root of 51957665 is about 373.1497959629.

The spelling of 51957665 in words is "fifty-one million, nine hundred fifty-seven thousand, six hundred sixty-five".