161817738027 has 16 divisors (see below), whose sum is σ = 235381808640. Its totient is φ = 98066959200.

The previous prime is 161817738013. The next prime is 161817738037. The reversal of 161817738027 is 720837718161.

It is not a de Polignac number, because 161817738027 - 2⁴ = 161817738011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161817738037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 733902 + ... + 928572.

It is an arithmetic number, because the mean of its divisors is an integer number (14711363040).

Almost surely, 2^161817738027 is an apocalyptic number.

161817738027 is a deficient number, since it is larger than the sum of its proper divisors (73564070613).

161817738027 is a wasteful number, since it uses less digits than its factorization.

161817738027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219874.

The product of its (nonzero) digits is 790272, while the sum is 51.

The spelling of 161817738027 in words is "one hundred sixty-one billion, eight hundred seventeen million, seven hundred thirty-eight thousand, twenty-seven".