66013660 has 12 divisors (see below), whose sum is σ = 138628728. Its totient is φ = 26405456.

The previous prime is 66013639. The next prime is 66013667. The reversal of 66013660 is 6631066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66013667) 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 3 ways as a sum of consecutive naturals, for example, 1650322 + ... + 1650361.

It is an arithmetic number, because the mean of its divisors is an integer number (11552394).

Almost surely, 2^66013660 is an apocalyptic number.

It is an amenable number.

66013660 is an abundant number, since it is smaller than the sum of its proper divisors (72615068).

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

66013660 is a wasteful number, since it uses less digits than its factorization.

66013660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300692 (or 3300690 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 66013660 is about 8124.8790760232. The cubic root of 66013660 is about 404.1518806131.

The spelling of 66013660 in words is "sixty-six million, thirteen thousand, six hundred sixty".