66205373 has 4 divisors (see below), whose sum is σ = 71298108. Its totient is φ = 61112640.

The previous prime is 66205343. The next prime is 66205393. The reversal of 66205373 is 37350266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37185604 + 29019769 = 6098^2 + 5387^2 .

It is a cyclic number.

It is not a de Polignac number, because 66205373 - 2⁶ = 66205309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66205333) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2546348 + ... + 2546373.

It is an arithmetic number, because the mean of its divisors is an integer number (17824527).

Almost surely, 2^66205373 is an apocalyptic number.

It is an amenable number.

66205373 is a deficient number, since it is larger than the sum of its proper divisors (5092735).

66205373 is a wasteful number, since it uses less digits than its factorization.

66205373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5092734.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 66205373 is about 8136.6684214118. The cubic root of 66205373 is about 404.5427405494.

The spelling of 66205373 in words is "sixty-six million, two hundred five thousand, three hundred seventy-three".