161440200943 has 4 divisors (see below), whose sum is σ = 184503086800. Its totient is φ = 138377315088.

The previous prime is 161440200941. The next prime is 161440200973. The reversal of 161440200943 is 349002044161.

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 161440200943 - 2¹ = 161440200941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161440200899 and 161440200908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161440200941) 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, 11531442918 + ... + 11531442931.

It is an arithmetic number, because the mean of its divisors is an integer number (46125771700).

Almost surely, 2^161440200943 is an apocalyptic number.

161440200943 is a deficient number, since it is larger than the sum of its proper divisors (23062885857).

161440200943 is an equidigital number, since it uses as much as digits as its factorization.

161440200943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23062885856.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 161440200943 in words is "one hundred sixty-one billion, four hundred forty million, two hundred thousand, nine hundred forty-three".