66816030 has 16 divisors (see below), whose sum is σ = 160358544. Its totient is φ = 17817600.

The previous prime is 66816011. The next prime is 66816031. The reversal of 66816030 is 3061866.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2227201 = 66816030 / (6 + 6 + 8 + 1 + 6 + 0 + 3 + 0).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66816031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1113571 + ... + 1113630.

It is an arithmetic number, because the mean of its divisors is an integer number (10022409).

Almost surely, 2^66816030 is an apocalyptic number.

66816030 is an abundant number, since it is smaller than the sum of its proper divisors (93542514).

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

66816030 is a wasteful number, since it uses less digits than its factorization.

66816030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227211.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 66816030 is about 8174.1072907077. The cubic root of 66816030 is about 405.7827264901.

Adding to 66816030 its reverse (3061866), we get a palindrome (69877896).

The spelling of 66816030 in words is "sixty-six million, eight hundred sixteen thousand, thirty".