66703445 has 4 divisors (see below), whose sum is σ = 80044140. Its totient is φ = 53362752.

The previous prime is 66703423. The next prime is 66703477. The reversal of 66703445 is 54430766.

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 43335889 + 23367556 = 6583^2 + 4834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66703445 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6670340 + ... + 6670349.

It is an arithmetic number, because the mean of its divisors is an integer number (20011035).

Almost surely, 2^66703445 is an apocalyptic number.

It is an amenable number.

66703445 is a deficient number, since it is larger than the sum of its proper divisors (13340695).

66703445 is a wasteful number, since it uses less digits than its factorization.

66703445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13340694.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 66703445 is about 8167.2177024982. The cubic root of 66703445 is about 405.5546837481.

The spelling of 66703445 in words is "sixty-six million, seven hundred three thousand, four hundred forty-five".