161161551110009 has 4 divisors (see below), whose sum is σ = 161835867223680. Its totient is φ = 160487234996340.

The previous prime is 161161551109973. The next prime is 161161551110033. The reversal of 161161551110009 is 900011155161161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161161551110009 - 2²⁰ = 161161550061433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161161551110059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337158056477 + ... + 337158056954.

It is an arithmetic number, because the mean of its divisors is an integer number (40458966805920).

Almost surely, 2^{161161551110009} is an apocalyptic number.

It is an amenable number.

161161551110009 is a deficient number, since it is larger than the sum of its proper divisors (674316113671).

161161551110009 is an equidigital number, since it uses as much as digits as its factorization.

161161551110009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674316113670.

The product of its (nonzero) digits is 8100, while the sum is 38.

The spelling of 161161551110009 in words is "one hundred sixty-one trillion, one hundred sixty-one billion, five hundred fifty-one million, one hundred ten thousand, nine".