66257648 has 20 divisors (see below), whose sum is σ = 128914368. Its totient is φ = 32989440.

The previous prime is 66257593. The next prime is 66257657. The reversal of 66257648 is 84675266.

66257648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 66257599 and 66257608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4736 + ... + 12447.

Almost surely, 2^66257648 is an apocalyptic number.

It is an amenable number.

66257648 is a deficient number, since it is larger than the sum of its proper divisors (62656720).

66257648 is a wasteful number, since it uses less digits than its factorization.

66257648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17432 (or 17426 counting only the distinct ones).

The product of its digits is 483840, while the sum is 44.

The square root of 66257648 is about 8139.8800973970. The cubic root of 66257648 is about 404.6491866344.

The spelling of 66257648 in words is "sixty-six million, two hundred fifty-seven thousand, six hundred forty-eight".