66012831 has 6 divisors (see below), whose sum is σ = 95351880. Its totient is φ = 44008548.

The previous prime is 66012823. The next prime is 66012833. The reversal of 66012831 is 13821066.

66012831 is a `hidden beast` number, since 6 + 601 + 28 + 31 = 666.

It is not a de Polignac number, because 66012831 - 2³ = 66012823 is a prime.

It is a super-2 number, since 2×66012831² = 8715387713269122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66012795 and 66012804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66012833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3667371 + ... + 3667388.

It is an arithmetic number, because the mean of its divisors is an integer number (15891980).

Almost surely, 2^66012831 is an apocalyptic number.

66012831 is a deficient number, since it is larger than the sum of its proper divisors (29339049).

66012831 is a wasteful number, since it uses less digits than its factorization.

66012831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7334765 (or 7334762 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 66012831 is about 8124.8280597192. The cubic root of 66012831 is about 404.1501888253.

Adding to 66012831 its reverse (13821066), we get a palindrome (79833897).

The spelling of 66012831 in words is "sixty-six million, twelve thousand, eight hundred thirty-one".