161243043263443 has 4 divisors (see below), whose sum is σ = 161243124284448. Its totient is φ = 161242962242440.

The previous prime is 161243043263411. The next prime is 161243043263461. The reversal of 161243043263443 is 344362340342161.

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

It is a cyclic number.

It is not a de Polignac number, because 161243043263443 - 2⁵ = 161243043263411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161243043263393 and 161243043263402.

It is not an unprimeable number, because it can be changed into a prime (161243043263243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37448128 + ... + 41531293.

It is an arithmetic number, because the mean of its divisors is an integer number (40310781071112).

Almost surely, 2^{161243043263443} is an apocalyptic number.

161243043263443 is a deficient number, since it is larger than the sum of its proper divisors (81021005).

161243043263443 is an equidigital number, since it uses as much as digits as its factorization.

161243043263443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81021004.

The product of its (nonzero) digits is 2985984, while the sum is 46.

The spelling of 161243043263443 in words is "one hundred sixty-one trillion, two hundred forty-three billion, forty-three million, two hundred sixty-three thousand, four hundred forty-three".