66012331 has 16 divisors (see below), whose sum is σ = 82632960. Its totient is φ = 51230880.

The previous prime is 66012301. The next prime is 66012347. The reversal of 66012331 is 13321066.

It is a cyclic number.

It is not a de Polignac number, because 66012331 - 2⁷ = 66012203 is a prime.

It is a super-2 number, since 2×66012331² = 8715255688107122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66012301) 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, 19120 + ... + 22306.

It is an arithmetic number, because the mean of its divisors is an integer number (5164560).

Almost surely, 2^66012331 is an apocalyptic number.

66012331 is a deficient number, since it is larger than the sum of its proper divisors (16620629).

66012331 is a wasteful number, since it uses less digits than its factorization.

66012331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3474.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 66012331 is about 8124.7972897790. The cubic root of 66012331 is about 404.1491684398.

Adding to 66012331 its reverse (13321066), we get a palindrome (79333397).

The spelling of 66012331 in words is "sixty-six million, twelve thousand, three hundred thirty-one".