66281793 has 16 divisors (see below), whose sum is σ = 93747456. Its totient is φ = 41511680.

The previous prime is 66281783. The next prime is 66281801. The reversal of 66281793 is 39718266.

It is a happy number.

66281793 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66281793 - 2¹⁸ = 66019649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66281723) 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 15 ways as a sum of consecutive naturals, for example, 41080 + ... + 42662.

It is an arithmetic number, because the mean of its divisors is an integer number (5859216).

Almost surely, 2^66281793 is an apocalyptic number.

It is an amenable number.

66281793 is a deficient number, since it is larger than the sum of its proper divisors (27465663).

66281793 is a wasteful number, since it uses less digits than its factorization.

66281793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424.

The product of its digits is 108864, while the sum is 42.

The square root of 66281793 is about 8141.3630922592. The cubic root of 66281793 is about 404.6983335045.

The spelling of 66281793 in words is "sixty-six million, two hundred eighty-one thousand, seven hundred ninety-three".