66203971 has 16 divisors (see below), whose sum is σ = 69870528. Its totient is φ = 62668800.

The previous prime is 66203947. The next prime is 66203983. The reversal of 66203971 is 17930266.

66203971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66203971 - 2⁷ = 66203843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66203911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257475 + ... + 257731.

It is an arithmetic number, because the mean of its divisors is an integer number (4366908).

Almost surely, 2^66203971 is an apocalyptic number.

66203971 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

66203971 is a deficient number, since it is larger than the sum of its proper divisors (3666557).

66203971 is a wasteful number, since it uses less digits than its factorization.

66203971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 66203971 is about 8136.5822677584. The cubic root of 66203971 is about 404.5398849256.

The spelling of 66203971 in words is "sixty-six million, two hundred three thousand, nine hundred seventy-one".