66404853 has 12 divisors (see below), whose sum is σ = 99471008. Its totient is φ = 44269740.

The previous prime is 66404851. The next prime is 66404879. The reversal of 66404853 is 35840466.

66404853 is a `hidden beast` number, since 6 + 640 + 4 + 8 + 5 + 3 = 666.

It is not a de Polignac number, because 66404853 - 2¹ = 66404851 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66404851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136393 + ... + 136878.

Almost surely, 2^66404853 is an apocalyptic number.

It is an amenable number.

66404853 is a deficient number, since it is larger than the sum of its proper divisors (33066155).

66404853 is an equidigital number, since it uses as much as digits as its factorization.

66404853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273286 (or 273274 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 66404853 is about 8148.9172900453. The cubic root of 66404853 is about 404.9486354612.

The spelling of 66404853 in words is "sixty-six million, four hundred four thousand, eight hundred fifty-three".