66111131 has 8 divisors (see below), whose sum is σ = 69492384. Its totient is φ = 62772160.

The previous prime is 66111109. The next prime is 66111163. The reversal of 66111131 is 13111166.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66111131 is a prime.

It is a super-2 number, since 2×66111131² = 8741363284198322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66111191) 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, 7340 + ... + 13641.

It is an arithmetic number, because the mean of its divisors is an integer number (8686548).

Almost surely, 2^66111131 is an apocalyptic number.

66111131 is a deficient number, since it is larger than the sum of its proper divisors (3381253).

66111131 is a wasteful number, since it uses less digits than its factorization.

66111131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21141.

The product of its digits is 108, while the sum is 20.

The square root of 66111131 is about 8130.8751681476. The cubic root of 66111131 is about 404.3506966132.

Adding to 66111131 its reverse (13111166), we get a palindrome (79222297).

The spelling of 66111131 in words is "sixty-six million, one hundred eleven thousand, one hundred thirty-one".