551353521220 has 48 divisors (see below), whose sum is σ = 1226258792640. Its totient is φ = 207652139136.

The previous prime is 551353521181. The next prime is 551353521233. The reversal of 551353521220 is 22125353155.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4388767 + ... + 4512646.

It is an arithmetic number, because the mean of its divisors is an integer number (25547058180).

Almost surely, 2^551353521220 is an apocalyptic number.

It is an amenable number.

551353521220 is an abundant number, since it is smaller than the sum of its proper divisors (674905271420).

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

551353521220 is a wasteful number, since it uses less digits than its factorization.

551353521220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8901604 (or 8901602 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 34.

Adding to 551353521220 its reverse (22125353155), we get a palindrome (573478874375).

The spelling of 551353521220 in words is "five hundred fifty-one billion, three hundred fifty-three million, five hundred twenty-one thousand, two hundred twenty".