66535867 has 4 divisors (see below), whose sum is σ = 66553776. Its totient is φ = 66517960.

The previous prime is 66535823. The next prime is 66535873. The reversal of 66535867 is 76853566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66535867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66535877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063 + ... + 11584.

It is an arithmetic number, because the mean of its divisors is an integer number (16638444).

Almost surely, 2^66535867 is an apocalyptic number.

66535867 is a deficient number, since it is larger than the sum of its proper divisors (17909).

66535867 is a wasteful number, since it uses less digits than its factorization.

66535867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17908.

The product of its digits is 907200, while the sum is 46.

The square root of 66535867 is about 8156.9520655696. The cubic root of 66535867 is about 405.2147760883.

The spelling of 66535867 in words is "sixty-six million, five hundred thirty-five thousand, eight hundred sixty-seven".