66879505 has 16 divisors (see below), whose sum is σ = 100059264. Its totient is φ = 41690880.

The previous prime is 66879503. The next prime is 66879521. The reversal of 66879505 is 50597866.

It is not a de Polignac number, because 66879505 - 2¹ = 66879503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66879503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86472 + ... + 87241.

It is an arithmetic number, because the mean of its divisors is an integer number (6253704).

Almost surely, 2^66879505 is an apocalyptic number.

It is an amenable number.

66879505 is a deficient number, since it is larger than the sum of its proper divisors (33179759).

66879505 is a wasteful number, since it uses less digits than its factorization.

66879505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173736.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 66879505 is about 8177.9890559966. The cubic root of 66879505 is about 405.9111832217.

The spelling of 66879505 in words is "sixty-six million, eight hundred seventy-nine thousand, five hundred five".