161616500 has 24 divisors (see below), whose sum is σ = 352971528. Its totient is φ = 64646400.

The previous prime is 161616491. The next prime is 161616577. The reversal of 161616500 is 5616161.

It can be written as a sum of positive squares in 4 ways, for example, as 478864 + 161137636 = 692^2 + 12694^2 .

It is a super-2 number, since 2×161616500² = 52239786144500000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161616500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161117 + ... + 162116.

It is an arithmetic number, because the mean of its divisors is an integer number (14707147).

Almost surely, 2^161616500 is an apocalyptic number.

161616500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161616500 is an abundant number, since it is smaller than the sum of its proper divisors (191355028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161616500 is a wasteful number, since it uses less digits than its factorization.

161616500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323252 (or 323240 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 161616500 is about 12712.8478320162. The cubic root of 161616500 is about 544.7056739208.

The spelling of 161616500 in words is "one hundred sixty-one million, six hundred sixteen thousand, five hundred".