66487205 has 4 divisors (see below), whose sum is σ = 79784652. Its totient is φ = 53189760.

The previous prime is 66487177. The next prime is 66487207. The reversal of 66487205 is 50278466.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 46977316 + 19509889 = 6854^2 + 4417^2 .

It is not a de Polignac number, because 66487205 - 2¹⁰ = 66486181 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 (66487207) 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, 6648716 + ... + 6648725.

It is an arithmetic number, because the mean of its divisors is an integer number (19946163).

Almost surely, 2^66487205 is an apocalyptic number.

It is an amenable number.

66487205 is a deficient number, since it is larger than the sum of its proper divisors (13297447).

66487205 is a wasteful number, since it uses less digits than its factorization.

66487205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13297446.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 66487205 is about 8153.9686656253. The cubic root of 66487205 is about 405.1159653694.

The spelling of 66487205 in words is "sixty-six million, four hundred eighty-seven thousand, two hundred five".