66775138 has 8 divisors (see below), whose sum is σ = 101860560. Its totient is φ = 32821620.

The previous prime is 66775123. The next prime is 66775153. The reversal of 66775138 is 83157766.

It is an interprime number because it is at equal distance from previous prime (66775123) and next prime (66775153).

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

It is a junction number, because it is equal to n+sod(n) for n = 66775094 and 66775103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282828 + ... + 283063.

It is an arithmetic number, because the mean of its divisors is an integer number (12732570).

Almost surely, 2^66775138 is an apocalyptic number.

66775138 is a deficient number, since it is larger than the sum of its proper divisors (35085422).

66775138 is a wasteful number, since it uses less digits than its factorization.

66775138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565952.

The product of its digits is 211680, while the sum is 43.

The square root of 66775138 is about 8171.6055949856. The cubic root of 66775138 is about 405.6999287270.

The spelling of 66775138 in words is "sixty-six million, seven hundred seventy-five thousand, one hundred thirty-eight".