66042213 has 8 divisors (see below), whose sum is σ = 88178400. Its totient is φ = 43967088.

The previous prime is 66042173. The next prime is 66042217. The reversal of 66042213 is 31224066.

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

It is not a de Polignac number, because 66042213 - 2¹² = 66038117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66042217) 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, 12678 + ... + 17111.

It is an arithmetic number, because the mean of its divisors is an integer number (11022300).

Almost surely, 2^66042213 is an apocalyptic number.

It is an amenable number.

66042213 is a deficient number, since it is larger than the sum of its proper divisors (22136187).

66042213 is a wasteful number, since it uses less digits than its factorization.

66042213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30531.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 66042213 is about 8126.6360199039. The cubic root of 66042213 is about 404.2101417127.

Adding to 66042213 its reverse (31224066), we get a palindrome (97266279).

The spelling of 66042213 in words is "sixty-six million, forty-two thousand, two hundred thirteen".