66486559 has 4 divisors (see below), whose sum is σ = 66894616. Its totient is φ = 66078504.

The previous prime is 66486551. The next prime is 66486571. The reversal of 66486559 is 95568466.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66486559 - 2³ = 66486551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66486551) 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, 203784 + ... + 204109.

It is an arithmetic number, because the mean of its divisors is an integer number (16723654).

Almost surely, 2^66486559 is an apocalyptic number.

66486559 is a deficient number, since it is larger than the sum of its proper divisors (408057).

66486559 is a wasteful number, since it uses less digits than its factorization.

66486559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408056.

The product of its digits is 1555200, while the sum is 49.

The square root of 66486559 is about 8153.9290529168. The cubic root of 66486559 is about 405.1146533087.

The spelling of 66486559 in words is "sixty-six million, four hundred eighty-six thousand, five hundred fifty-nine".