551243512155020 has 24 divisors (see below), whose sum is σ = 1157611848648864. Its totient is φ = 220497314743296.

The previous prime is 551243512155001. The next prime is 551243512155139. The reversal of 551243512155020 is 20551215342155.

It is a super-2 number, since 2×551243512155020² (a number of 30 digits) contains 22 as substring.

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, 68010284 + ... + 75682796.

It is an arithmetic number, because the mean of its divisors is an integer number (48233827027036).

Almost surely, 2^{551243512155020} is an apocalyptic number.

It is an amenable number.

551243512155020 is an abundant number, since it is smaller than the sum of its proper divisors (606368336493844).

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

551243512155020 is a wasteful number, since it uses less digits than its factorization.

551243512155020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11264849 (or 11264847 counting only the distinct ones).

The product of its (nonzero) digits is 300000, while the sum is 41.

Adding to 551243512155020 its reverse (20551215342155), we get a palindrome (571794727497175).

The spelling of 551243512155020 in words is "five hundred fifty-one trillion, two hundred forty-three billion, five hundred twelve million, one hundred fifty-five thousand, twenty".