75665109 has 8 divisors (see below), whose sum is σ = 108647392. Its totient is φ = 46563120.

The previous prime is 75665099. The next prime is 75665129. The reversal of 75665109 is 90156657.

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

It is not a de Polignac number, because 75665109 - 2⁹ = 75664597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1940131 = 75665109 / (7 + 5 + 6 + 6 + 5 + 1 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75665129) 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, 970027 + ... + 970104.

It is an arithmetic number, because the mean of its divisors is an integer number (13580924).

Almost surely, 2^75665109 is an apocalyptic number.

It is an amenable number.

75665109 is a deficient number, since it is larger than the sum of its proper divisors (32982283).

75665109 is a wasteful number, since it uses less digits than its factorization.

75665109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940147.

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 75665109 is about 8698.5693651313. The cubic root of 75665109 is about 422.9592760173.

The spelling of 75665109 in words is "seventy-five million, six hundred sixty-five thousand, one hundred nine".