66193938 has 12 divisors (see below), whose sum is σ = 143420238. Its totient is φ = 22064640.

The previous prime is 66193927. The next prime is 66193943. The reversal of 66193938 is 83939166.

It can be written as a sum of positive squares in only one way, i.e., 60419529 + 5774409 = 7773^2 + 2403^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66193893 and 66193902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1838703 + ... + 1838738.

Almost surely, 2^66193938 is an apocalyptic number.

66193938 is an abundant number, since it is smaller than the sum of its proper divisors (77226300).

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

66193938 is a wasteful number, since it uses less digits than its factorization.

66193938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677449 (or 3677446 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 66193938 is about 8135.9657078923. The cubic root of 66193938 is about 404.5194483181.

The spelling of 66193938 in words is "sixty-six million, one hundred ninety-three thousand, nine hundred thirty-eight".