51550066 has 4 divisors (see below), whose sum is σ = 77325102. Its totient is φ = 25775032.

The previous prime is 51550049. The next prime is 51550073. The reversal of 51550066 is 66005515.

51550066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 49914225 + 1635841 = 7065^2 + 1279^2 .

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 as a sum of consecutive naturals, namely, 12887515 + ... + 12887518.

Almost surely, 2^51550066 is an apocalyptic number.

51550066 is a deficient number, since it is larger than the sum of its proper divisors (25775036).

51550066 is a wasteful number, since it uses less digits than its factorization.

51550066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25775035.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 51550066 is about 7179.8374633414. The cubic root of 51550066 is about 372.1714677593.

The spelling of 51550066 in words is "fifty-one million, five hundred fifty thousand, sixty-six".