551055561220 has 24 divisors (see below), whose sum is σ = 1179050957784. Its totient is φ = 216263314176.

The previous prime is 551055561113. The next prime is 551055561227. The reversal of 551055561220 is 22165550155.

It can be written as a sum of positive squares in 4 ways, for example, as 106337296836 + 444718264384 = 326094^2 + 666872^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 551055561220.

It is not an unprimeable number, because it can be changed into a prime (551055561227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259930809 + ... + 259932928.

It is an arithmetic number, because the mean of its divisors is an integer number (49127123241).

Almost surely, 2^551055561220 is an apocalyptic number.

It is an amenable number.

551055561220 is an abundant number, since it is smaller than the sum of its proper divisors (627995396564).

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

551055561220 is a wasteful number, since it uses less digits than its factorization.

551055561220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519863799 (or 519863797 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 37.

The spelling of 551055561220 in words is "five hundred fifty-one billion, fifty-five million, five hundred sixty-one thousand, two hundred twenty".