551220331000 has 64 divisors (see below), whose sum is σ = 1331463893760. Its totient is φ = 213375600000.

The previous prime is 551220330989. The next prime is 551220331007. The reversal of 551220331000 is 133022155.

It is a super-2 number, since 2×551220331000² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551220331007) 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 15 ways as a sum of consecutive naturals, for example, 8859651 + ... + 8921650.

It is an arithmetic number, because the mean of its divisors is an integer number (20804123340).

Almost surely, 2^551220331000 is an apocalyptic number.

551220331000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

551220331000 is an abundant number, since it is smaller than the sum of its proper divisors (780243562760).

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

551220331000 is a wasteful number, since it uses less digits than its factorization.

551220331000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17781353 (or 17781339 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

Adding to 551220331000 its reverse (133022155), we get a palindrome (551353353155).

The spelling of 551220331000 in words is "five hundred fifty-one billion, two hundred twenty million, three hundred thirty-one thousand".