161543366605 has 8 divisors (see below), whose sum is σ = 202280389632. Its totient is φ = 123615793488.

The previous prime is 161543366561. The next prime is 161543366641. The reversal of 161543366605 is 506663345161.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 161543366605 - 2⁹ = 161543366093 is a prime.

It is a Duffinian 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, 702362349 + ... + 702362578.

It is an arithmetic number, because the mean of its divisors is an integer number (25285048704).

Almost surely, 2^161543366605 is an apocalyptic number.

It is an amenable number.

161543366605 is a deficient number, since it is larger than the sum of its proper divisors (40737023027).

161543366605 is a wasteful number, since it uses less digits than its factorization.

161543366605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404724955.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 161543366605 in words is "one hundred sixty-one billion, five hundred forty-three million, three hundred sixty-six thousand, six hundred five".