155855520 has 72 divisors (see below), whose sum is σ = 531861876. Its totient is φ = 41561088.

The previous prime is 155855519. The next prime is 155855551. The reversal of 155855520 is 25558551.

155855520 is a `hidden beast` number, since 1 + 5 + 585 + 55 + 20 = 666.

155855520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 155451024 + 404496 = 12468^2 + 636^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×155855520² = 48581886228940800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52677 + ... + 55556.

Almost surely, 2^155855520 is an apocalyptic number.

155855520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155855520 is an abundant number, since it is smaller than the sum of its proper divisors (376006356).

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

155855520 is a wasteful number, since it uses less digits than its factorization.

155855520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108254 (or 108243 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 36.

The square root of 155855520 is about 12484.2108280820. The cubic root of 155855520 is about 538.1550204411.

The spelling of 155855520 in words is "one hundred fifty-five million, eight hundred fifty-five thousand, five hundred twenty".