66535717 has 4 divisors (see below), whose sum is σ = 66563200. Its totient is φ = 66508236.

The previous prime is 66535687. The next prime is 66535769. The reversal of 66535717 is 71753566.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66535717 - 2⁷ = 66535589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66535717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66535787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9717 + ... + 15082.

It is an arithmetic number, because the mean of its divisors is an integer number (16640800).

Almost surely, 2^66535717 is an apocalyptic number.

It is an amenable number.

66535717 is a deficient number, since it is larger than the sum of its proper divisors (27483).

66535717 is a wasteful number, since it uses less digits than its factorization.

66535717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27482.

The product of its digits is 132300, while the sum is 40.

The square root of 66535717 is about 8156.9428709536. The cubic root of 66535717 is about 405.2144715795.

The spelling of 66535717 in words is "sixty-six million, five hundred thirty-five thousand, seven hundred seventeen".