161185973303 has 4 divisors (see below), whose sum is σ = 161187469008. Its totient is φ = 161184477600.

The previous prime is 161185973293. The next prime is 161185973329. The reversal of 161185973303 is 303379581161.

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 161185973303 - 2¹⁰ = 161185972279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161185973353) 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, 572498 + ... + 806303.

It is an arithmetic number, because the mean of its divisors is an integer number (40296867252).

Almost surely, 2^161185973303 is an apocalyptic number.

161185973303 is a deficient number, since it is larger than the sum of its proper divisors (1495705).

161185973303 is a wasteful number, since it uses less digits than its factorization.

161185973303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495704.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 161185973303 in words is "one hundred sixty-one billion, one hundred eighty-five million, nine hundred seventy-three thousand, three hundred three".