155500900 has 81 divisors (see below), whose sum is σ = 357790251. Its totient is φ = 58658880.

The previous prime is 155500843. The next prime is 155500949. The reversal of 155500900 is 9005551.

The square root of 155500900 is 12470.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 2137444 + 153363456 = 1462^2 + 12384^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3616279 + ... + 3616321.

Almost surely, 2^155500900 is an apocalyptic number.

155500900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155500900 is the 12470-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155500900

155500900 is an abundant number, since it is smaller than the sum of its proper divisors (202289351).

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

155500900 is a wasteful number, since it uses less digits than its factorization.

155500900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 25.

The cubic root of 155500900 is about 537.7465535542.

Multiplying 155500900 by its sum of digits (25), we get a square (3887522500 = 62350²).

155500900 divided by its sum of digits (25) gives a square (6220036 = 2494²).

The spelling of 155500900 in words is "one hundred fifty-five million, five hundred thousand, nine hundred".