161363603 has 4 divisors (see below), whose sum is σ = 161766408. Its totient is φ = 160960800.

The previous prime is 161363593. The next prime is 161363639. The reversal of 161363603 is 306363161.

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 161363603 - 2⁸ = 161363347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161363203) 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, 200801 + ... + 201602.

It is an arithmetic number, because the mean of its divisors is an integer number (40441602).

Almost surely, 2^161363603 is an apocalyptic number.

161363603 is a deficient number, since it is larger than the sum of its proper divisors (402805).

161363603 is an equidigital number, since it uses as much as digits as its factorization.

161363603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402804.

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 161363603 is about 12702.8974253908. The cubic root of 161363603 is about 544.4214076775.

The spelling of 161363603 in words is "one hundred sixty-one million, three hundred sixty-three thousand, six hundred three".