66874409 has 16 divisors (see below), whose sum is σ = 82329600. Its totient is φ = 53056080.

The previous prime is 66874387. The next prime is 66874421. The reversal of 66874409 is 90447866.

It is not a de Polignac number, because 66874409 - 2⁸ = 66874153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66874409.

It is not an unprimeable number, because it can be changed into a prime (66874439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1709 + ... + 11690.

It is an arithmetic number, because the mean of its divisors is an integer number (5145600).

Almost surely, 2^66874409 is an apocalyptic number.

It is an amenable number.

66874409 is a deficient number, since it is larger than the sum of its proper divisors (15455191).

66874409 is a wasteful number, since it uses less digits than its factorization.

66874409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13460.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 66874409 is about 8177.6774820239. The cubic root of 66874409 is about 405.9008732574.

The spelling of 66874409 in words is "sixty-six million, eight hundred seventy-four thousand, four hundred nine".