161065800009 has 6 divisors (see below), whose sum is σ = 232650600026. Its totient is φ = 107377200000.

The previous prime is 161065799953. The next prime is 161065800023. The reversal of 161065800009 is 900008560161.

It can be written as a sum of positive squares in only one way, i.e., 144943911225 + 16121888784 = 380715^2 + 126972^2 .

It is not a de Polignac number, because 161065800009 - 2¹⁷ = 161065668937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161065800029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8948099992 + ... + 8948100009.

Almost surely, 2^161065800009 is an apocalyptic number.

It is an amenable number.

161065800009 is a deficient number, since it is larger than the sum of its proper divisors (71584800017).

161065800009 is a wasteful number, since it uses less digits than its factorization.

161065800009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17896200007 (or 17896200004 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 161065800009 in words is "one hundred sixty-one billion, sixty-five million, eight hundred thousand, nine".