66000031 has 4 divisors (see below), whose sum is σ = 66640912. Its totient is φ = 65359152.

The previous prime is 66000029. The next prime is 66000043. The reversal of 66000031 is 13000066.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66000031 - 2¹ = 66000029 is a prime.

It is a super-2 number, since 2×66000031² = 8712008184001922, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 65999969 and 66000014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66000071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320286 + ... + 320491.

It is an arithmetic number, because the mean of its divisors is an integer number (16660228).

Almost surely, 2^66000031 is an apocalyptic number.

66000031 is a deficient number, since it is larger than the sum of its proper divisors (640881).

66000031 is a wasteful number, since it uses less digits than its factorization.

66000031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640880.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 66000031 is about 8124.0403125538. The cubic root of 66000031 is about 404.1240653341.

Adding to 66000031 its reverse (13000066), we get a palindrome (79000097).

The spelling of 66000031 in words is "sixty-six million, thirty-one", and thus it is an aban number and an uban number.