66748135 has 4 divisors (see below), whose sum is σ = 80097768. Its totient is φ = 53398504.

The previous prime is 66748117. The next prime is 66748141. The reversal of 66748135 is 53184766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53184766 = 2 ⋅26592383.

It is a cyclic number.

It is not a de Polignac number, because 66748135 - 2¹¹ = 66746087 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

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, 6674809 + ... + 6674818.

It is an arithmetic number, because the mean of its divisors is an integer number (20024442).

Almost surely, 2^66748135 is an apocalyptic number.

66748135 is a deficient number, since it is larger than the sum of its proper divisors (13349633).

66748135 is a wasteful number, since it uses less digits than its factorization.

66748135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13349632.

The product of its digits is 120960, while the sum is 40.

The square root of 66748135 is about 8169.9531822404. The cubic root of 66748135 is about 405.6452347569.

The spelling of 66748135 in words is "sixty-six million, seven hundred forty-eight thousand, one hundred thirty-five".