16161603 has 4 divisors (see below), whose sum is σ = 21548808. Its totient is φ = 10774400.

The previous prime is 16161589. The next prime is 16161623. The reversal of 16161603 is 30616161.

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 16161603 - 2⁸ = 16161347 is a prime.

It is a super-2 number, since 2×16161603² = 522394823059218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16161623) 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, 2693598 + ... + 2693603.

It is an arithmetic number, because the mean of its divisors is an integer number (5387202).

Almost surely, 2^16161603 is an apocalyptic number.

16161603 is a deficient number, since it is larger than the sum of its proper divisors (5387205).

16161603 is an equidigital number, since it uses as much as digits as its factorization.

16161603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387204.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 16161603 is about 4020.1496240812. The cubic root of 16161603 is about 252.8297322808.

Adding to 16161603 its reverse (30616161), we get a palindrome (46777764).

The spelling of 16161603 in words is "sixteen million, one hundred sixty-one thousand, six hundred three".