66257244 has 24 divisors (see below), whose sum is σ = 171778320. Its totient is φ = 22085712.

The previous prime is 66257239. The next prime is 66257251. The reversal of 66257244 is 44275266.

66257244 is a `hidden beast` number, since 6 + 625 + 7 + 24 + 4 = 666.

66257244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66257199 and 66257208.

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 7 ways as a sum of consecutive naturals, for example, 306639 + ... + 306854.

It is an arithmetic number, because the mean of its divisors is an integer number (7157430).

Almost surely, 2^66257244 is an apocalyptic number.

It is an amenable number.

66257244 is an abundant number, since it is smaller than the sum of its proper divisors (105521076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66257244 is a wasteful number, since it uses less digits than its factorization.

66257244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613506 (or 613498 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 66257244 is about 8139.8552812688. The cubic root of 66257244 is about 404.6483641954.

The spelling of 66257244 in words is "sixty-six million, two hundred fifty-seven thousand, two hundred forty-four".