161761785043 has 4 divisors (see below), whose sum is σ = 161823505248. Its totient is φ = 161700064840.

The previous prime is 161761784953. The next prime is 161761785079. The reversal of 161761785043 is 340587167161.

161761785043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161761785043 - 2²⁵ = 161728230611 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161761785343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30856171 + ... + 30861412.

It is an arithmetic number, because the mean of its divisors is an integer number (40455876312).

Almost surely, 2^161761785043 is an apocalyptic number.

161761785043 is a deficient number, since it is larger than the sum of its proper divisors (61720205).

161761785043 is an equidigital number, since it uses as much as digits as its factorization.

161761785043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61720204.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 161761785043 in words is "one hundred sixty-one billion, seven hundred sixty-one million, seven hundred eighty-five thousand, forty-three".