66839169 has 16 divisors (see below), whose sum is σ = 94177280. Its totient is φ = 42048720.

The previous prime is 66839167. The next prime is 66839177. The reversal of 66839169 is 96193866.

It is not a de Polignac number, because 66839169 - 2¹ = 66839167 is a prime.

It is a super-2 number, since 2×66839169² = 8934949025221122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66839167) 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, 13284 + ... + 17610.

It is an arithmetic number, because the mean of its divisors is an integer number (5886080).

Almost surely, 2^66839169 is an apocalyptic number.

It is an amenable number.

66839169 is a deficient number, since it is larger than the sum of its proper divisors (27338111).

66839169 is a wasteful number, since it uses less digits than its factorization.

66839169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4620.

The product of its digits is 419904, while the sum is 48.

The square root of 66839169 is about 8175.5225521064. The cubic root of 66839169 is about 405.8295631691.

The spelling of 66839169 in words is "sixty-six million, eight hundred thirty-nine thousand, one hundred sixty-nine".