551205323220 has 24 divisors (see below), whose sum is σ = 1543374905184. Its totient is φ = 146988086176.

The previous prime is 551205323209. The next prime is 551205323257. The reversal of 551205323220 is 22323502155.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4593377634 + ... + 4593377753.

It is an arithmetic number, because the mean of its divisors is an integer number (64307287716).

Almost surely, 2^551205323220 is an apocalyptic number.

It is an amenable number.

551205323220 is an abundant number, since it is smaller than the sum of its proper divisors (992169581964).

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

551205323220 is a wasteful number, since it uses less digits than its factorization.

551205323220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9186755399 (or 9186755397 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 551205323220 its reverse (22323502155), we get a palindrome (573528825375).

The spelling of 551205323220 in words is "five hundred fifty-one billion, two hundred five million, three hundred twenty-three thousand, two hundred twenty".