66853405 has 8 divisors (see below), whose sum is σ = 81738072. Its totient is φ = 52473408.

The previous prime is 66853379. The next prime is 66853417. The reversal of 66853405 is 50435866.

It can be written as a sum of positive squares in 4 ways, for example, as 7901721 + 58951684 = 2811^2 + 7678^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66853405 - 2¹⁹ = 66329117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125874 + ... + 126403.

It is an arithmetic number, because the mean of its divisors is an integer number (10217259).

Almost surely, 2^66853405 is an apocalyptic number.

It is an amenable number.

66853405 is a deficient number, since it is larger than the sum of its proper divisors (14884667).

66853405 is a wasteful number, since it uses less digits than its factorization.

66853405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252335.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 66853405 is about 8176.3931534632. The cubic root of 66853405 is about 405.8583735190.

It can be divided in two parts, 66 and 853405, that added together give a triangular number (853471 = T₁₃₀₆).

The spelling of 66853405 in words is "sixty-six million, eight hundred fifty-three thousand, four hundred five".