66581652 has 24 divisors (see below), whose sum is σ = 157677856. Its totient is φ = 21862368.

The previous prime is 66581633. The next prime is 66581653. The reversal of 66581652 is 25618566.

66581652 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

66581652 is strictly pandigital in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 66581652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66581653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40603 + ... + 42210.

Almost surely, 2^66581652 is an apocalyptic number.

It is an amenable number.

66581652 is an abundant number, since it is smaller than the sum of its proper divisors (91096204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66581652 is a wasteful number, since it uses less digits than its factorization.

66581652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82887 (or 82885 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 66581652 is about 8159.7580846493. The cubic root of 66581652 is about 405.3077009294.

The spelling of 66581652 in words is "sixty-six million, five hundred eighty-one thousand, six hundred fifty-two".