66544445 has 24 divisors (see below), whose sum is σ = 90084960. Its totient is φ = 46797600.

The previous prime is 66544397. The next prime is 66544459. The reversal of 66544445 is 54444566.

It is not a de Polignac number, because 66544445 - 2¹⁸ = 66282301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66544399 and 66544408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52226 + ... + 53484.

It is an arithmetic number, because the mean of its divisors is an integer number (3753540).

Almost surely, 2^66544445 is an apocalyptic number.

It is an amenable number.

66544445 is a deficient number, since it is larger than the sum of its proper divisors (23540515).

66544445 is a wasteful number, since it uses less digits than its factorization.

66544445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337 (or 1306 counting only the distinct ones).

The product of its digits is 230400, while the sum is 38.

The square root of 66544445 is about 8157.4778577695. The cubic root of 66544445 is about 405.2321891676.

The spelling of 66544445 in words is "sixty-six million, five hundred forty-four thousand, four hundred forty-five".