161800618816361 has 8 divisors (see below), whose sum is σ = 184915829735040. Its totient is φ = 138685617098208.

The previous prime is 161800618816321. The next prime is 161800618816453. The reversal of 161800618816361 is 163618816008161.

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 161800618816361 - 2²² = 161800614622057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161800618816297 and 161800618816306.

It is not an unprimeable number, because it can be changed into a prime (161800618816321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50639276 + ... + 53739533.

It is an arithmetic number, because the mean of its divisors is an integer number (23114478716880).

Almost surely, 2^{161800618816361} is an apocalyptic number.

It is an amenable number.

161800618816361 is a deficient number, since it is larger than the sum of its proper divisors (23115210918679).

161800618816361 is a wasteful number, since it uses less digits than its factorization.

161800618816361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104600263.

The product of its (nonzero) digits is 1990656, while the sum is 56.

The spelling of 161800618816361 in words is "one hundred sixty-one trillion, eight hundred billion, six hundred eighteen million, eight hundred sixteen thousand, three hundred sixty-one".