155521312200 has 144 divisors (see below), whose sum is σ = 541636739280. Its totient is φ = 41472336960.

The previous prime is 155521312171. The next prime is 155521312223. The reversal of 155521312200 is 2213125551.

155521312200 is a `hidden beast` number, since 15 + 5 + 521 + 3 + 122 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1551414 + ... + 1648613.

It is an arithmetic number, because the mean of its divisors is an integer number (3761366245).

Almost surely, 2^155521312200 is an apocalyptic number.

155521312200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155521312200 is an abundant number, since it is smaller than the sum of its proper divisors (386115427080).

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

155521312200 is a wasteful number, since it uses less digits than its factorization.

155521312200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3200058 (or 3200037 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 155521312200 its reverse (2213125551), we get a palindrome (157734437751).

The spelling of 155521312200 in words is "one hundred fifty-five billion, five hundred twenty-one million, three hundred twelve thousand, two hundred".