66257493 has 8 divisors (see below), whose sum is σ = 88534368. Its totient is φ = 44076144.

The previous prime is 66257467. The next prime is 66257497. The reversal of 66257493 is 39475266.

66257493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66257493 - 2¹⁷ = 66126421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66257497) by changing a digit.

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, 22246 + ... + 25047.

It is an arithmetic number, because the mean of its divisors is an integer number (11066796).

Almost surely, 2^66257493 is an apocalyptic number.

It is an amenable number.

66257493 is a deficient number, since it is larger than the sum of its proper divisors (22276875).

66257493 is a wasteful number, since it uses less digits than its factorization.

66257493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47763.

The product of its digits is 272160, while the sum is 42.

The square root of 66257493 is about 8139.8705763667. The cubic root of 66257493 is about 404.6488710951.

The spelling of 66257493 in words is "sixty-six million, two hundred fifty-seven thousand, four hundred ninety-three".