66075639 has 8 divisors (see below), whose sum is σ = 100686720. Its totient is φ = 37757496.

The previous prime is 66075629. The next prime is 66075661. The reversal of 66075639 is 93657066.

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

It is not a de Polignac number, because 66075639 - 2⁹ = 66075127 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 66075639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66075629) 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, 1573209 + ... + 1573250.

It is an arithmetic number, because the mean of its divisors is an integer number (12585840).

Almost surely, 2^66075639 is an apocalyptic number.

66075639 is a deficient number, since it is larger than the sum of its proper divisors (34611081).

66075639 is a wasteful number, since it uses less digits than its factorization.

66075639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146469.

The product of its (nonzero) digits is 204120, while the sum is 42.

The square root of 66075639 is about 8128.6923302583. The cubic root of 66075639 is about 404.2783246155.

It can be divided in two parts, 6607 and 5639, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 66075639 in words is "sixty-six million, seventy-five thousand, six hundred thirty-nine".