205161500165 has 8 divisors (see below), whose sum is σ = 246283964448. Its totient is φ = 164069090640.

The previous prime is 205161500119. The next prime is 205161500183. The reversal of 205161500165 is 561005161502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205161500165 - 2¹⁴ = 205161483781 is a prime.

It is a super-2 number, since 2×205161500165² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7498667 + ... + 7525976.

It is an arithmetic number, because the mean of its divisors is an integer number (30785495556).

Almost surely, 2^205161500165 is an apocalyptic number.

It is an amenable number.

205161500165 is a deficient number, since it is larger than the sum of its proper divisors (41122464283).

205161500165 is a wasteful number, since it uses less digits than its factorization.

205161500165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15027379.

The product of its (nonzero) digits is 9000, while the sum is 32.

Adding to 205161500165 its reverse (561005161502), we get a palindrome (766166661667).

The spelling of 205161500165 in words is "two hundred five billion, one hundred sixty-one million, five hundred thousand, one hundred sixty-five".