66853381 has 16 divisors (see below), whose sum is σ = 83203200. Its totient is φ = 52411968.

The previous prime is 66853379. The next prime is 66853417. The reversal of 66853381 is 18335866.

66853381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66853381 - 2¹ = 66853379 is a prime.

It is a super-2 number, since 2×66853381² = 8938749102262322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66853331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4810 + ... + 12523.

It is an arithmetic number, because the mean of its divisors is an integer number (5200200).

Almost surely, 2^66853381 is an apocalyptic number.

It is an amenable number.

66853381 is a deficient number, since it is larger than the sum of its proper divisors (16349819).

66853381 is a wasteful number, since it uses less digits than its factorization.

66853381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17388.

The product of its digits is 103680, while the sum is 40.

The square root of 66853381 is about 8176.3916858233. The cubic root of 66853381 is about 405.8583249520.

The spelling of 66853381 in words is "sixty-six million, eight hundred fifty-three thousand, three hundred eighty-one".