66601213 has 16 divisors (see below), whose sum is σ = 80773120. Its totient is φ = 53642736.

The previous prime is 66601207. The next prime is 66601217. The reversal of 66601213 is 31210666.

It is not a de Polignac number, because 66601213 - 2⁵ = 66601181 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 (66601217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14920 + ... + 18862.

It is an arithmetic number, because the mean of its divisors is an integer number (5048320).

Almost surely, 2^66601213 is an apocalyptic number.

It is an amenable number.

66601213 is a deficient number, since it is larger than the sum of its proper divisors (14171907).

66601213 is a wasteful number, since it uses less digits than its factorization.

66601213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4096.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 66601213 is about 8160.9566228476. The cubic root of 66601213 is about 405.3473887784.

Adding to 66601213 its reverse (31210666), we get a palindrome (97811879).

The spelling of 66601213 in words is "sixty-six million, six hundred one thousand, two hundred thirteen".