66466021 has 8 divisors (see below), whose sum is σ = 69785280. Its totient is φ = 63182592.

The previous prime is 66466019. The next prime is 66466031. The reversal of 66466021 is 12066466.

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 66466021 - 2¹ = 66466019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66466031) 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, 5116 + ... + 12613.

It is an arithmetic number, because the mean of its divisors is an integer number (8723160).

Almost surely, 2^66466021 is an apocalyptic number.

It is an amenable number.

66466021 is a deficient number, since it is larger than the sum of its proper divisors (3319259).

66466021 is a wasteful number, since it uses less digits than its factorization.

66466021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17915.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 66466021 is about 8152.6695627874. The cubic root of 66466021 is about 405.0729350940.

The spelling of 66466021 in words is "sixty-six million, four hundred sixty-six thousand, twenty-one".