66885321 has 8 divisors (see below), whose sum is σ = 92057344. Its totient is φ = 43151760.

The previous prime is 66885211. The next prime is 66885349. The reversal of 66885321 is 12358866.

It is a happy number.

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

It is not a de Polignac number, because 66885321 - 2⁷ = 66885193 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 66885321.

It is not an unprimeable number, because it can be changed into a prime (66885121) 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, 359506 + ... + 359691.

It is an arithmetic number, because the mean of its divisors is an integer number (11507168).

Almost surely, 2^66885321 is an apocalyptic number.

It is an amenable number.

66885321 is a deficient number, since it is larger than the sum of its proper divisors (25172023).

66885321 is a wasteful number, since it uses less digits than its factorization.

66885321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719231.

The product of its digits is 69120, while the sum is 39.

The square root of 66885321 is about 8178.3446369054. The cubic root of 66885321 is about 405.9229492130.

The spelling of 66885321 in words is "sixty-six million, eight hundred eighty-five thousand, three hundred twenty-one".