66135693 has 16 divisors (see below), whose sum is σ = 95147136. Its totient is φ = 40620480.

The previous prime is 66135683. The next prime is 66135697. The reversal of 66135693 is 39653166.

It is not a de Polignac number, because 66135693 - 2⁸ = 66135437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66135697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23923 + ... + 26543.

It is an arithmetic number, because the mean of its divisors is an integer number (5946696).

Almost surely, 2^66135693 is an apocalyptic number.

It is an amenable number.

66135693 is a deficient number, since it is larger than the sum of its proper divisors (29011443).

66135693 is a wasteful number, since it uses less digits than its factorization.

66135693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3284.

The product of its digits is 87480, while the sum is 39.

The square root of 66135693 is about 8132.3854433985. The cubic root of 66135693 is about 404.4007660037.

The spelling of 66135693 in words is "sixty-six million, one hundred thirty-five thousand, six hundred ninety-three".