66581852 has 12 divisors (see below), whose sum is σ = 122650920. Its totient is φ = 31538736.

The previous prime is 66581821. The next prime is 66581857. The reversal of 66581852 is 25818566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66581857) by changing a digit.

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, 437963 + ... + 438114.

It is an arithmetic number, because the mean of its divisors is an integer number (10220910).

Almost surely, 2^66581852 is an apocalyptic number.

It is an amenable number.

66581852 is a deficient number, since it is larger than the sum of its proper divisors (56069068).

66581852 is a wasteful number, since it uses less digits than its factorization.

66581852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876100 (or 876098 counting only the distinct ones).

The product of its digits is 115200, while the sum is 41.

The square root of 66581852 is about 8159.7703399054. The cubic root of 66581852 is about 405.3081067542.

The spelling of 66581852 in words is "sixty-six million, five hundred eighty-one thousand, eight hundred fifty-two".