66860539 has 4 divisors (see below), whose sum is σ = 66877056. Its totient is φ = 66844024.

The previous prime is 66860533. The next prime is 66860561. The reversal of 66860539 is 93506866.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66860539 - 2¹⁵ = 66827771 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66860495 and 66860504.

It is not an unprimeable number, because it can be changed into a prime (66860533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2397 + ... + 11809.

It is an arithmetic number, because the mean of its divisors is an integer number (16719264).

Almost surely, 2^66860539 is an apocalyptic number.

66860539 is a deficient number, since it is larger than the sum of its proper divisors (16517).

66860539 is an equidigital number, since it uses as much as digits as its factorization.

66860539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16516.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 66860539 is about 8176.8293977556. The cubic root of 66860539 is about 405.8728095359.

The spelling of 66860539 in words is "sixty-six million, eight hundred sixty thousand, five hundred thirty-nine".