161234545103 has 4 divisors (see below), whose sum is σ = 161235937608. Its totient is φ = 161233152600.

The previous prime is 161234545081. The next prime is 161234545163. The reversal of 161234545103 is 301545432161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 301545432161 = 19 ⋅15870812219.

It is a cyclic number.

It is not a de Polignac number, because 161234545103 - 2¹⁸ = 161234282959 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 (161234545163) 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, 505073 + ... + 759978.

It is an arithmetic number, because the mean of its divisors is an integer number (40308984402).

Almost surely, 2^161234545103 is an apocalyptic number.

161234545103 is a deficient number, since it is larger than the sum of its proper divisors (1392505).

161234545103 is a wasteful number, since it uses less digits than its factorization.

161234545103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392504.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 161234545103 its reverse (301545432161), we get a palindrome (462779977264).

The spelling of 161234545103 in words is "one hundred sixty-one billion, two hundred thirty-four million, five hundred forty-five thousand, one hundred three".