505212155550 has 144 divisors (see below), whose sum is σ = 1442924187120. Its totient is φ = 126368640000.

The previous prime is 505212155549. The next prime is 505212155561. The reversal of 505212155550 is 55551212505.

505212155550 is a `hidden beast` number, since 5 + 0 + 52 + 1 + 2 + 1 + 55 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 571030 + ... + 1156070.

It is an arithmetic number, because the mean of its divisors is an integer number (10020306855).

Almost surely, 2^505212155550 is an apocalyptic number.

505212155550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 505212155550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (721462093560).

505212155550 is an abundant number, since it is smaller than the sum of its proper divisors (937712031570).

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

505212155550 is a wasteful number, since it uses less digits than its factorization.

505212155550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585179 (or 585171 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 36.

The spelling of 505212155550 in words is "five hundred five billion, two hundred twelve million, one hundred fifty-five thousand, five hundred fifty".