51665777 has 8 divisors (see below), whose sum is σ = 53180352. Its totient is φ = 50173200.

The previous prime is 51665741. The next prime is 51665827. The reversal of 51665777 is 77756615.

51665777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51665777 - 2¹⁴ = 51649393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51665077) 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 7 ways as a sum of consecutive naturals, for example, 674 + ... + 10187.

It is an arithmetic number, because the mean of its divisors is an integer number (6647544).

Almost surely, 2^51665777 is an apocalyptic number.

It is an amenable number.

51665777 is a deficient number, since it is larger than the sum of its proper divisors (1514575).

51665777 is a wasteful number, since it uses less digits than its factorization.

51665777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10999.

The product of its digits is 308700, while the sum is 44.

The square root of 51665777 is about 7187.8909980606. The cubic root of 51665777 is about 372.4497225057.

The spelling of 51665777 in words is "fifty-one million, six hundred sixty-five thousand, seven hundred seventy-seven".