161941354559 has 4 divisors (see below), whose sum is σ = 165707432616. Its totient is φ = 158175276504.

The previous prime is 161941354529. The next prime is 161941354613. The reversal of 161941354559 is 955453149161.

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 161941354559 - 2²⁰ = 161940305983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161941354559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161941354529) 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, 1883038964 + ... + 1883039049.

It is an arithmetic number, because the mean of its divisors is an integer number (41426858154).

Almost surely, 2^161941354559 is an apocalyptic number.

161941354559 is a deficient number, since it is larger than the sum of its proper divisors (3766078057).

161941354559 is an equidigital number, since it uses as much as digits as its factorization.

161941354559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766078056.

The product of its digits is 2916000, while the sum is 53.

The spelling of 161941354559 in words is "one hundred sixty-one billion, nine hundred forty-one million, three hundred fifty-four thousand, five hundred fifty-nine".