66111309 has 24 divisors (see below), whose sum is σ = 108038112. Its totient is φ = 40065840.

The previous prime is 66111293. The next prime is 66111337. The reversal of 66111309 is 90311166.

It is not a de Polignac number, because 66111309 - 2⁴ = 66111293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66111359) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9694 + ... + 15039.

It is an arithmetic number, because the mean of its divisors is an integer number (4501588).

Almost surely, 2^66111309 is an apocalyptic number.

It is an amenable number.

66111309 is a deficient number, since it is larger than the sum of its proper divisors (41926803).

66111309 is a wasteful number, since it uses less digits than its factorization.

66111309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24759 (or 24747 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 66111309 is about 8130.8861140715. The cubic root of 66111309 is about 404.3510595090.

The spelling of 66111309 in words is "sixty-six million, one hundred eleven thousand, three hundred nine".