66551252 has 12 divisors (see below), whose sum is σ = 118662516. Its totient is φ = 32647680.

The previous prime is 66551239. The next prime is 66551267. The reversal of 66551252 is 25215566.

It can be written as a sum of positive squares in 2 ways, for example, as 30958096 + 35593156 = 5564^2 + 5966^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156749 + ... + 157172.

It is an arithmetic number, because the mean of its divisors is an integer number (9888543).

Almost surely, 2^66551252 is an apocalyptic number.

It is an amenable number.

66551252 is a deficient number, since it is larger than the sum of its proper divisors (52111264).

66551252 is a wasteful number, since it uses less digits than its factorization.

66551252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313978 (or 313976 counting only the distinct ones).

The product of its digits is 18000, while the sum is 32.

The square root of 66551252 is about 8157.8950716469. The cubic root of 66551252 is about 405.2460061058.

The spelling of 66551252 in words is "sixty-six million, five hundred fifty-one thousand, two hundred fifty-two".