161345603 has 4 divisors (see below), whose sum is σ = 162373440. Its totient is φ = 160317768.

The previous prime is 161345599. The next prime is 161345627. The reversal of 161345603 is 306543161.

It is a happy number.

161345603 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, and also an emirpimes, since its reverse is a distinct semiprime: 306543161 = 1471 ⋅208391.

It is a cyclic number.

It is not a de Polignac number, because 161345603 - 2² = 161345599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161345683) 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, 513683 + ... + 513996.

It is an arithmetic number, because the mean of its divisors is an integer number (40593360).

Almost surely, 2^161345603 is an apocalyptic number.

161345603 is a deficient number, since it is larger than the sum of its proper divisors (1027837).

161345603 is a wasteful number, since it uses less digits than its factorization.

161345603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027836.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 161345603 is about 12702.1889058540. The cubic root of 161345603 is about 544.4011636457.

Adding to 161345603 its reverse (306543161), we get a palindrome (467888764).

The spelling of 161345603 in words is "one hundred sixty-one million, three hundred forty-five thousand, six hundred three".