66615330 has 48 divisors (see below), whose sum is σ = 168761664. Its totient is φ = 16826400.

The previous prime is 66615319. The next prime is 66615359. The reversal of 66615330 is 3351666.

66615330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 in 23 ways as a sum of consecutive naturals, for example, 7755 + ... + 13905.

It is an arithmetic number, because the mean of its divisors is an integer number (3515868).

Almost surely, 2^66615330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66615330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84380832).

66615330 is an abundant number, since it is smaller than the sum of its proper divisors (102146334).

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

66615330 is a wasteful number, since it uses less digits than its factorization.

66615330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6199 (or 6180 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 66615330 is about 8161.8214878788. The cubic root of 66615330 is about 405.3760263190.

Adding to 66615330 its reverse (3351666), we get a palindrome (69966996).

The spelling of 66615330 in words is "sixty-six million, six hundred fifteen thousand, three hundred thirty".