155605500 has 144 divisors (see below), whose sum is σ = 496292160. Its totient is φ = 41040000.

The previous prime is 155605477. The next prime is 155605531. The reversal of 155605500 is 5506551.

155605500 is a `hidden beast` number, since 1 + 5 + 5 + 605 + 50 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 679386 + ... + 679614.

Almost surely, 2^155605500 is an apocalyptic number.

155605500 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 155605500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248146080).

155605500 is an abundant number, since it is smaller than the sum of its proper divisors (340686660).

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

155605500 is a wasteful number, since it uses less digits than its factorization.

155605500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 155605500 is about 12474.1933606947. The cubic root of 155605500 is about 537.8671009425.

The spelling of 155605500 in words is "one hundred fifty-five million, six hundred five thousand, five hundred".