66211131 has 8 divisors (see below), whose sum is σ = 100893184. Its totient is φ = 37834920.

The previous prime is 66211129. The next prime is 66211163. The reversal of 66211131 is 13111266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66211131 - 2¹ = 66211129 is a prime.

It is a super-2 number, since 2×66211131² = 8767827736598322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 3152911 = 66211131 / (6 + 6 + 2 + 1 + 1 + 1 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 66211098 and 66211107.

It is not an unprimeable number, because it can be changed into a prime (66211111) 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, 1576435 + ... + 1576476.

It is an arithmetic number, because the mean of its divisors is an integer number (12611648).

Almost surely, 2^66211131 is an apocalyptic number.

66211131 is a deficient number, since it is larger than the sum of its proper divisors (34682053).

66211131 is a wasteful number, since it uses less digits than its factorization.

66211131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152921.

The product of its digits is 216, while the sum is 21.

The square root of 66211131 is about 8137.0222440399. The cubic root of 66211131 is about 404.5544681453.

Adding to 66211131 its reverse (13111266), we get a palindrome (79322397).

The spelling of 66211131 in words is "sixty-six million, two hundred eleven thousand, one hundred thirty-one".