161198407181 has 16 divisors (see below), whose sum is σ = 188789783424. Its totient is φ = 134757290304.

The previous prime is 161198407103. The next prime is 161198407231. The reversal of 161198407181 is 181704891161.

It is not a de Polignac number, because 161198407181 - 2³⁰ = 160124665357 is a prime.

It is a super-2 number, since 2×161198407181² (a number of 23 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 (161198403181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191750 + ... + 599303.

It is an arithmetic number, because the mean of its divisors is an integer number (11799361464).

Almost surely, 2^161198407181 is an apocalyptic number.

It is an amenable number.

161198407181 is a deficient number, since it is larger than the sum of its proper divisors (27591376243).

161198407181 is an equidigital number, since it uses as much as digits as its factorization.

161198407181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791780.

The product of its (nonzero) digits is 96768, while the sum is 47.

The spelling of 161198407181 in words is "one hundred sixty-one billion, one hundred ninety-eight million, four hundred seven thousand, one hundred eighty-one".