66817382 has 16 divisors (see below), whose sum is σ = 102228480. Its totient is φ = 32744712.

The previous prime is 66817381. The next prime is 66817393. The reversal of 66817382 is 28371866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66817381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54023 + ... + 55245.

It is an arithmetic number, because the mean of its divisors is an integer number (6389280).

Almost surely, 2^66817382 is an apocalyptic number.

66817382 is a deficient number, since it is larger than the sum of its proper divisors (35411098).

66817382 is a wasteful number, since it uses less digits than its factorization.

66817382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747.

The product of its digits is 96768, while the sum is 41.

The square root of 66817382 is about 8174.1899904517. The cubic root of 66817382 is about 405.7854634309.

The spelling of 66817382 in words is "sixty-six million, eight hundred seventeen thousand, three hundred eighty-two".