161841006865855 has 8 divisors (see below), whose sum is σ = 194270069808864. Its totient is φ = 129432231112800.

The previous prime is 161841006865843. The next prime is 161841006865873. The reversal of 161841006865855 is 558568600148161.

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

It is not a de Polignac number, because 161841006865855 - 2²³ = 161840998477247 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, 5071779936 + ... + 5071811845.

It is an arithmetic number, because the mean of its divisors is an integer number (24283758726108).

Almost surely, 2^{161841006865855} is an apocalyptic number.

161841006865855 is a deficient number, since it is larger than the sum of its proper divisors (32429062943009).

161841006865855 is a wasteful number, since it uses less digits than its factorization.

161841006865855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10143594977.

The product of its (nonzero) digits is 55296000, while the sum is 64.

The spelling of 161841006865855 in words is "one hundred sixty-one trillion, eight hundred forty-one billion, six million, eight hundred sixty-five thousand, eight hundred fifty-five".