161618183670847 has 4 divisors (see below), whose sum is σ = 165986242689016. Its totient is φ = 157250124652680.

The previous prime is 161618183670809. The next prime is 161618183670913. The reversal of 161618183670847 is 748076381816161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161618183670847 is a prime.

It is a super-2 number, since 2×161618183670847² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161618183670247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2184029509029 + ... + 2184029509102.

It is an arithmetic number, because the mean of its divisors is an integer number (41496560672254).

Almost surely, 2^{161618183670847} is an apocalyptic number.

161618183670847 is a deficient number, since it is larger than the sum of its proper divisors (4368059018169).

161618183670847 is an equidigital number, since it uses as much as digits as its factorization.

161618183670847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4368059018168.

The product of its (nonzero) digits is 65028096, while the sum is 67.

The spelling of 161618183670847 in words is "one hundred sixty-one trillion, six hundred eighteen billion, one hundred eighty-three million, six hundred seventy thousand, eight hundred forty-seven".