66013867 has 4 divisors (see below), whose sum is σ = 66035736. Its totient is φ = 65992000.

The previous prime is 66013837. The next prime is 66013949. The reversal of 66013867 is 76831066.

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-66013867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66013807) 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, 5509 + ... + 12742.

It is an arithmetic number, because the mean of its divisors is an integer number (16508934).

Almost surely, 2^66013867 is an apocalyptic number.

66013867 is a deficient number, since it is larger than the sum of its proper divisors (21869).

66013867 is a wasteful number, since it uses less digits than its factorization.

66013867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21868.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 66013867 is about 8124.8918146644. The cubic root of 66013867 is about 404.1523030476.

The spelling of 66013867 in words is "sixty-six million, thirteen thousand, eight hundred sixty-seven".