66304621 has 8 divisors (see below), whose sum is σ = 68249600. Its totient is φ = 64387440.

The previous prime is 66304619. The next prime is 66304627. The reversal of 66304621 is 12640366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66304621 - 2¹ = 66304619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66304621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66304627) 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, 2061 + ... + 11698.

It is an arithmetic number, because the mean of its divisors is an integer number (8531200).

Almost surely, 2^66304621 is an apocalyptic number.

66304621 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

66304621 is a deficient number, since it is larger than the sum of its proper divisors (1944979).

66304621 is a wasteful number, since it uses less digits than its factorization.

66304621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13899.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66304621 is about 8142.7649480996. The cubic root of 66304621 is about 404.7447886607.

Adding to 66304621 its reverse (12640366), we get a palindrome (78944987).

The spelling of 66304621 in words is "sixty-six million, three hundred four thousand, six hundred twenty-one".