161283645731178 has 80 divisors (see below), whose sum is σ = 380215002520584. Its totient is φ = 51032399362560.

The previous prime is 161283645731147. The next prime is 161283645731179. The reversal of 161283645731178 is 871137546382161.

It is a happy number.

161283645731178 is a `hidden beast` number, since 1 + 6 + 1 + 2 + 8 + 3 + 6 + 457 + 3 + 1 + 178 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 110873887130889 + 50409758600289 = 10529667^2 + 7099983^2 .

It is not an unprimeable number, because it can be changed into a prime (161283645731179) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 327894675 + ... + 328386182.

Almost surely, 2^{161283645731178} is an apocalyptic number.

161283645731178 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161283645731178 is an abundant number, since it is smaller than the sum of its proper divisors (218931356789406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161283645731178 is a wasteful number, since it uses less digits than its factorization.

161283645731178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656280949 (or 656280940 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The spelling of 161283645731178 in words is "one hundred sixty-one trillion, two hundred eighty-three billion, six hundred forty-five million, seven hundred thirty-one thousand, one hundred seventy-eight".