165165000561 has 80 divisors (see below), whose sum is σ = 272970168768. Its totient is φ = 98692214400.

The previous prime is 165165000541. The next prime is 165165000571. The reversal of 165165000561 is 165000561561.

It is not a de Polignac number, because 165165000561 - 2¹⁰ = 165164999537 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (165165000541) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 18320691 + ... + 18329703.

Almost surely, 2^165165000561 is an apocalyptic number.

165165000561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165165000561 is a deficient number, since it is larger than the sum of its proper divisors (107805168207).

165165000561 is a wasteful number, since it uses less digits than its factorization.

165165000561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9324 (or 9315 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 165165000561 in words is "one hundred sixty-five billion, one hundred sixty-five million, five hundred sixty-one", and thus it is an aban number.