66424645 has 24 divisors (see below), whose sum is σ = 95931000. Its totient is φ = 43972992.

The previous prime is 66424613. The next prime is 66424681. The reversal of 66424645 is 54642466.

66424645 is nontrivially palindromic in base 6.

It can be written as a sum of positive squares in 4 ways, for example, as 17522596 + 48902049 = 4186^2 + 6993^2 .

It is not a de Polignac number, because 66424645 - 2⁵ = 66424613 is a prime.

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, 2431 + ... + 11779.

It is an arithmetic number, because the mean of its divisors is an integer number (3997125).

Almost surely, 2^66424645 is an apocalyptic number.

It is an amenable number.

66424645 is a deficient number, since it is larger than the sum of its proper divisors (29506355).

66424645 is a wasteful number, since it uses less digits than its factorization.

66424645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9397 (or 9390 counting only the distinct ones).

The product of its digits is 138240, while the sum is 37.

The square root of 66424645 is about 8150.1315940296. The cubic root of 66424645 is about 404.9888631800.

The spelling of 66424645 in words is "sixty-six million, four hundred twenty-four thousand, six hundred forty-five".