66605231 has 8 divisors (see below), whose sum is σ = 83040384. Its totient is φ = 51900120.

The previous prime is 66605221. The next prime is 66605233. The reversal of 66605231 is 13250666.

66605231 = 125² + 126² + ... + 586².

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 66605231 - 2¹⁸ = 66343087 is a prime.

It is a super-2 number, since 2×66605231² = 8872513593126722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66605194 and 66605203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66605233) 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, 432425 + ... + 432578.

It is an arithmetic number, because the mean of its divisors is an integer number (10380048).

Almost surely, 2^66605231 is an apocalyptic number.

66605231 is a deficient number, since it is larger than the sum of its proper divisors (16435153).

66605231 is a wasteful number, since it uses less digits than its factorization.

66605231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865021.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66605231 is about 8161.2027912557. The cubic root of 66605231 is about 405.3555400467.

Adding to 66605231 its reverse (13250666), we get a palindrome (79855897).

The spelling of 66605231 in words is "sixty-six million, six hundred five thousand, two hundred thirty-one".