51866785 has 16 divisors (see below), whose sum is σ = 64164672. Its totient is φ = 40219200.

The previous prime is 51866767. The next prime is 51866791. The reversal of 51866785 is 58766815.

51866785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51866785 - 2¹⁵ = 51834017 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 15 ways as a sum of consecutive naturals, for example, 90550 + ... + 91120.

It is an arithmetic number, because the mean of its divisors is an integer number (4010292).

Almost surely, 2^51866785 is an apocalyptic number.

It is an amenable number.

51866785 is a deficient number, since it is larger than the sum of its proper divisors (12297887).

51866785 is a wasteful number, since it uses less digits than its factorization.

51866785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104.

The product of its digits is 403200, while the sum is 46.

The square root of 51866785 is about 7201.8598292386. The cubic root of 51866785 is about 372.9321081934.

The spelling of 51866785 in words is "fifty-one million, eight hundred sixty-six thousand, seven hundred eighty-five".