161000000165 has 16 divisors (see below), whose sum is σ = 207918232560. Its totient is φ = 119236254720.

The previous prime is 161000000093. The next prime is 161000000177. The reversal of 161000000165 is 561000000161.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3512458756 + 157487541409 = 59266^2 + 396847^2 .

It is not a de Polignac number, because 161000000165 - 2¹⁰ = 160999999141 is a prime.

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, 15520370 + ... + 15530739.

It is an arithmetic number, because the mean of its divisors is an integer number (12994889535).

Almost surely, 2^161000000165 is an apocalyptic number.

It is an amenable number.

161000000165 is a deficient number, since it is larger than the sum of its proper divisors (46918232395).

161000000165 is a wasteful number, since it uses less digits than its factorization.

161000000165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31051192.

The product of its (nonzero) digits is 180, while the sum is 20.

The spelling of 161000000165 in words is "one hundred sixty-one billion, one hundred sixty-five", and thus it is an aban number.