65561165165 has 16 divisors (see below), whose sum is σ = 78842040768. Its totient is φ = 52336628736.

The previous prime is 65561165149. The next prime is 65561165177. The reversal of 65561165165 is 56156116556.

It is a cyclic number.

It is not a de Polignac number, because 65561165165 - 2⁴ = 65561165149 is a prime.

It is a super-3 number, since 3×65561165165³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4802189 + ... + 4815821.

It is an arithmetic number, because the mean of its divisors is an integer number (4927627548).

Almost surely, 2^65561165165 is an apocalyptic number.

It is an amenable number.

65561165165 is a deficient number, since it is larger than the sum of its proper divisors (13280875603).

65561165165 is a wasteful number, since it uses less digits than its factorization.

65561165165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15628.

The product of its digits is 810000, while the sum is 47.

The spelling of 65561165165 in words is "sixty-five billion, five hundred sixty-one million, one hundred sixty-five thousand, one hundred sixty-five".