161342217037 has 4 divisors (see below), whose sum is σ = 161344760476. Its totient is φ = 161339673600.

The previous prime is 161342217031. The next prime is 161342217041. The reversal of 161342217037 is 730712243161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 730712243161 = 67 ⋅10906152883.

It can be written as a sum of positive squares in 2 ways, for example, as 144282983716 + 17059233321 = 379846^2 + 130611^2 .

It is a cyclic number.

It is not a de Polignac number, because 161342217037 - 2¹⁹ = 161341692749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161342216987 and 161342217005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161342217031) 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, 1174068 + ... + 1304269.

It is an arithmetic number, because the mean of its divisors is an integer number (40336190119).

Almost surely, 2^161342217037 is an apocalyptic number.

It is an amenable number.

161342217037 is a deficient number, since it is larger than the sum of its proper divisors (2543439).

161342217037 is an equidigital number, since it uses as much as digits as its factorization.

161342217037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543438.

The product of its (nonzero) digits is 42336, while the sum is 37.

The spelling of 161342217037 in words is "one hundred sixty-one billion, three hundred forty-two million, two hundred seventeen thousand, thirty-seven".