66306331 has 32 divisors (see below), whose sum is σ = 85800960. Its totient is φ = 49838976.

The previous prime is 66306311. The next prime is 66306337. The reversal of 66306331 is 13360366.

It is a cyclic number.

It is not a de Polignac number, because 66306331 - 2⁹ = 66305819 is a prime.

It is a super-2 number, since 2×66306331² = 8793059061363122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66306331.

It is not an unprimeable number, because it can be changed into a prime (66306337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158040 + ... + 158458.

It is an arithmetic number, because the mean of its divisors is an integer number (2681280).

Almost surely, 2^66306331 is an apocalyptic number.

66306331 is a deficient number, since it is larger than the sum of its proper divisors (19494629).

66306331 is a wasteful number, since it uses less digits than its factorization.

66306331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523.

The product of its (nonzero) digits is 5832, while the sum is 28.

The square root of 66306331 is about 8142.8699486115. The cubic root of 66306331 is about 404.7482680947.

Adding to 66306331 its reverse (13360366), we get a palindrome (79666697).

The spelling of 66306331 in words is "sixty-six million, three hundred six thousand, three hundred thirty-one".