161616403 has 16 divisors (see below), whose sum is σ = 179536896. Its totient is φ = 144537120.

The previous prime is 161616353. The next prime is 161616419. The reversal of 161616403 is 304616161.

It is a de Polignac number, because none of the positive numbers 2^k-161616403 is a prime.

It is a super-2 number, since 2×161616403² = 52239723437316818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161616443) 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, 72126 + ... + 74332.

It is an arithmetic number, because the mean of its divisors is an integer number (11221056).

Almost surely, 2^161616403 is an apocalyptic number.

161616403 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

161616403 is a deficient number, since it is larger than the sum of its proper divisors (17920493).

161616403 is a wasteful number, since it uses less digits than its factorization.

161616403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 161616403 is about 12712.8440169775. The cubic root of 161616403 is about 544.7055649458.

The spelling of 161616403 in words is "one hundred sixty-one million, six hundred sixteen thousand, four hundred three".