66675139 has 4 divisors (see below), whose sum is σ = 70597224. Its totient is φ = 62753056.

The previous prime is 66675109. The next prime is 66675157. The reversal of 66675139 is 93157666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66675139 - 2⁹ = 66674627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66675095 and 66675104.

It is not an unprimeable number, because it can be changed into a prime (66675109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1961017 + ... + 1961050.

It is an arithmetic number, because the mean of its divisors is an integer number (17649306).

Almost surely, 2^66675139 is an apocalyptic number.

66675139 is a deficient number, since it is larger than the sum of its proper divisors (3922085).

66675139 is a wasteful number, since it uses less digits than its factorization.

66675139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3922084.

The product of its digits is 204120, while the sum is 43.

The square root of 66675139 is about 8165.4846151346. The cubic root of 66675139 is about 405.4973091249.

The spelling of 66675139 in words is "sixty-six million, six hundred seventy-five thousand, one hundred thirty-nine".