155505203120 has 40 divisors (see below), whose sum is σ = 364749172416. Its totient is φ = 61651616768.

The previous prime is 155505203111. The next prime is 155505203123. The reversal of 155505203120 is 21302505551.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (155505203123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8591912 + ... + 8609991.

Almost surely, 2^155505203120 is an apocalyptic number.

155505203120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155505203120 is an abundant number, since it is smaller than the sum of its proper divisors (209243969296).

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

155505203120 is a wasteful number, since it uses less digits than its factorization.

155505203120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17202029 (or 17202023 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

Adding to 155505203120 its reverse (21302505551), we get a palindrome (176807708671).

The spelling of 155505203120 in words is "one hundred fifty-five billion, five hundred five million, two hundred three thousand, one hundred twenty".