66104639 has 8 divisors (see below), whose sum is σ = 67393872. Its totient is φ = 64825920.

The previous prime is 66104611. The next prime is 66104657. The reversal of 66104639 is 93640166.

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-66104639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66104599 and 66104608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66104699) 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, 10712 + ... + 15714.

It is an arithmetic number, because the mean of its divisors is an integer number (8424234).

Almost surely, 2^66104639 is an apocalyptic number.

66104639 is a deficient number, since it is larger than the sum of its proper divisors (1289233).

66104639 is a wasteful number, since it uses less digits than its factorization.

66104639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5257.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 66104639 is about 8130.4759393285. The cubic root of 66104639 is about 404.3374606643.

The spelling of 66104639 in words is "sixty-six million, one hundred four thousand, six hundred thirty-nine".