155587785550 has 24 divisors (see below), whose sum is σ = 289860856200. Its totient is φ = 62134560480.

The previous prime is 155587785491. The next prime is 155587785557. The reversal of 155587785550 is 55587785551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155587785557) 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 11 ways as a sum of consecutive naturals, for example, 2482585 + ... + 2544484.

It is an arithmetic number, because the mean of its divisors is an integer number (12077535675).

Almost surely, 2^155587785550 is an apocalyptic number.

155587785550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155587785550 is a deficient number, since it is larger than the sum of its proper divisors (134273070650).

155587785550 is a wasteful number, since it uses less digits than its factorization.

155587785550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027700 (or 5027695 counting only the distinct ones).

The product of its (nonzero) digits is 49000000, while the sum is 61.

Subtracting from 155587785550 its reverse (55587785551), we obtain a palindrome (99999999999).

The spelling of 155587785550 in words is "one hundred fifty-five billion, five hundred eighty-seven million, seven hundred eighty-five thousand, five hundred fifty".