66700579 has 4 divisors (see below), whose sum is σ = 72764280. Its totient is φ = 60636880.

The previous prime is 66700573. The next prime is 66700597. The reversal of 66700579 is 97500766.

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 66700579 - 2⁵ = 66700547 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66700573) 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, 3031834 + ... + 3031855.

It is an arithmetic number, because the mean of its divisors is an integer number (18191070).

Almost surely, 2^66700579 is an apocalyptic number.

66700579 is a deficient number, since it is larger than the sum of its proper divisors (6063701).

66700579 is a wasteful number, since it uses less digits than its factorization.

66700579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6063700.

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 66700579 is about 8167.0422430645. The cubic root of 66700579 is about 405.5488752707.

The spelling of 66700579 in words is "sixty-six million, seven hundred thousand, five hundred seventy-nine".