66109071 has 8 divisors (see below), whose sum is σ = 100737664. Its totient is φ = 37776600.

The previous prime is 66109031. The next prime is 66109079. The reversal of 66109071 is 17090166.

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

It is not a de Polignac number, because 66109071 - 2⁶ = 66109007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66109079) 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 7 ways as a sum of consecutive naturals, for example, 1574005 + ... + 1574046.

It is an arithmetic number, because the mean of its divisors is an integer number (12592208).

Almost surely, 2^66109071 is an apocalyptic number.

66109071 is a deficient number, since it is larger than the sum of its proper divisors (34628593).

66109071 is a wasteful number, since it uses less digits than its factorization.

66109071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3148061.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 66109071 is about 8130.7484895303. The cubic root of 66109071 is about 404.3464967603.

The spelling of 66109071 in words is "sixty-six million, one hundred nine thousand, seventy-one".