66601231 has 8 divisors (see below), whose sum is σ = 68122944. Its totient is φ = 65089440.

The previous prime is 66601217. The next prime is 66601247. The reversal of 66601231 is 13210666.

66601231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66601231 is a prime.

It is a super-2 number, since 2×66601231² = 8871447941430722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66601196 and 66601205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66601831) 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 7 ways as a sum of consecutive naturals, for example, 12045 + ... + 16681.

It is an arithmetic number, because the mean of its divisors is an integer number (8515368).

Almost surely, 2^66601231 is an apocalyptic number.

66601231 is a deficient number, since it is larger than the sum of its proper divisors (1521713).

66601231 is a wasteful number, since it uses less digits than its factorization.

66601231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4961.

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

The square root of 66601231 is about 8160.9577256594. The cubic root of 66601231 is about 405.3474252955.

Adding to 66601231 its reverse (13210666), we get a palindrome (79811897).

The spelling of 66601231 in words is "sixty-six million, six hundred one thousand, two hundred thirty-one".