665611005205 has 16 divisors (see below), whose sum is σ = 814854959424. Its totient is φ = 521823329280.

The previous prime is 665611005187. The next prime is 665611005209. The reversal of 665611005205 is 502500116566.

It is not a de Polignac number, because 665611005205 - 2¹³ = 665610997013 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 (665611005209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5082751 + ... + 5212060.

It is an arithmetic number, because the mean of its divisors is an integer number (50928434964).

Almost surely, 2^665611005205 is an apocalyptic number.

It is an amenable number.

665611005205 is a deficient number, since it is larger than the sum of its proper divisors (149243954219).

665611005205 is a wasteful number, since it uses less digits than its factorization.

665611005205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10295076.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 665611005205 in words is "six hundred sixty-five billion, six hundred eleven million, five thousand, two hundred five".