551011133500 has 48 divisors (see below), whose sum is σ = 1204810195680. Its totient is φ = 220147699200.

The previous prime is 551011133447. The next prime is 551011133509. The reversal of 551011133500 is 5331110155.

It is a happy number.

It is a super-2 number, since 2×551011133500² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551011133509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211957 + ... + 1070956.

It is an arithmetic number, because the mean of its divisors is an integer number (25100212410).

Almost surely, 2^551011133500 is an apocalyptic number.

551011133500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

551011133500 is an abundant number, since it is smaller than the sum of its proper divisors (653799062180).

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

551011133500 is a wasteful number, since it uses less digits than its factorization.

551011133500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283791 (or 1283779 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 25.

Adding to 551011133500 its reverse (5331110155), we get a palindrome (556342243655).

The spelling of 551011133500 in words is "five hundred fifty-one billion, eleven million, one hundred thirty-three thousand, five hundred".