66538435 has 8 divisors (see below), whose sum is σ = 80022096. Its totient is φ = 53113440.

The previous prime is 66538421. The next prime is 66538481. The reversal of 66538435 is 53483566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66538435 - 2⁵ = 66538403 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12129 + ... + 16738.

It is an arithmetic number, because the mean of its divisors is an integer number (10002762).

Almost surely, 2^66538435 is an apocalyptic number.

66538435 is a deficient number, since it is larger than the sum of its proper divisors (13483661).

66538435 is a wasteful number, since it uses less digits than its factorization.

66538435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29333.

The product of its digits is 259200, while the sum is 40.

The square root of 66538435 is about 8157.1094757886. The cubic root of 66538435 is about 405.2199892072.

The spelling of 66538435 in words is "sixty-six million, five hundred thirty-eight thousand, four hundred thirty-five".