155505210120 has 96 divisors (see below), whose sum is σ = 544268251800. Its totient is φ = 38278204416.

The previous prime is 155505210043. The next prime is 155505210149. The reversal of 155505210120 is 21012505551.

155505210120 is a `hidden beast` number, since 1 + 5 + 550 + 5 + 2 + 101 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 139820653476 + 15684556644 = 373926^2 + 125238^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16609125 + ... + 16618484.

Almost surely, 2^155505210120 is an apocalyptic number.

155505210120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155505210120 is an abundant number, since it is smaller than the sum of its proper divisors (388763041680).

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

155505210120 is a wasteful number, since it uses less digits than its factorization.

155505210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33227639 (or 33227632 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

Adding to 155505210120 its reverse (21012505551), we get a palindrome (176517715671).

The spelling of 155505210120 in words is "one hundred fifty-five billion, five hundred five million, two hundred ten thousand, one hundred twenty".