66340445 has 8 divisors (see below), whose sum is σ = 81760344. Its totient is φ = 51637824.

The previous prime is 66340433. The next prime is 66340481. The reversal of 66340445 is 54404366.

It can be written as a sum of positive squares in 4 ways, for example, as 13734436 + 52606009 = 3706^2 + 7253^2 .

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 66340445 - 2¹⁶ = 66274909 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, 179114 + ... + 179483.

It is an arithmetic number, because the mean of its divisors is an integer number (10220043).

Almost surely, 2^66340445 is an apocalyptic number.

It is an amenable number.

66340445 is a deficient number, since it is larger than the sum of its proper divisors (15419899).

66340445 is a wasteful number, since it uses less digits than its factorization.

66340445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358639.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 66340445 is about 8144.9643952567. The cubic root of 66340445 is about 404.8176692862.

The spelling of 66340445 in words is "sixty-six million, three hundred forty thousand, four hundred forty-five".