161655500 has 48 divisors (see below), whose sum is σ = 368432064. Its totient is φ = 61846400.

The previous prime is 161655469. The next prime is 161655503. The reversal of 161655500 is 5556161.

It is a super-2 number, since 2×161655500² = 52265001360500000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (161655503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4472 + ... + 18528.

It is an arithmetic number, because the mean of its divisors is an integer number (7675668).

Almost surely, 2^161655500 is an apocalyptic number.

161655500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161655500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184216032).

161655500 is an abundant number, since it is smaller than the sum of its proper divisors (206776564).

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

161655500 is a wasteful number, since it uses less digits than its factorization.

161655500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14099 (or 14087 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 161655500 is about 12714.3816208261. The cubic root of 161655500 is about 544.7494850678.

The spelling of 161655500 in words is "one hundred sixty-one million, six hundred fifty-five thousand, five hundred".