66535321 has 8 divisors (see below), whose sum is σ = 70174080. Its totient is φ = 62910288.

The previous prime is 66535291. The next prime is 66535327. The reversal of 66535321 is 12353566.

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 66535321 - 2²³ = 58146713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66535327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7440 + ... + 13726.

It is an arithmetic number, because the mean of its divisors is an integer number (8771760).

Almost surely, 2^66535321 is an apocalyptic number.

It is an amenable number.

66535321 is a deficient number, since it is larger than the sum of its proper divisors (3638759).

66535321 is a wasteful number, since it uses less digits than its factorization.

66535321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6863.

The product of its digits is 16200, while the sum is 31.

The square root of 66535321 is about 8156.9185971174. The cubic root of 66535321 is about 405.2136676742.

Adding to 66535321 its reverse (12353566), we get a palindrome (78888887).

The spelling of 66535321 in words is "sixty-six million, five hundred thirty-five thousand, three hundred twenty-one".