161345503 has 16 divisors (see below), whose sum is σ = 180930816. Its totient is φ = 142611840.

The previous prime is 161345497. The next prime is 161345533. The reversal of 161345503 is 305543161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161345503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161345533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123751 + ... + 125047.

It is an arithmetic number, because the mean of its divisors is an integer number (11308176).

Almost surely, 2^161345503 is an apocalyptic number.

161345503 is a deficient number, since it is larger than the sum of its proper divisors (19585313).

161345503 is a wasteful number, since it uses less digits than its factorization.

161345503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 161345503 is about 12702.1849695239. The cubic root of 161345503 is about 544.4010511747.

Adding to 161345503 its reverse (305543161), we get a palindrome (466888664).

The spelling of 161345503 in words is "one hundred sixty-one million, three hundred forty-five thousand, five hundred three".