551251220520 has 1024 divisors, whose sum is σ = 2291264962560. Its totient is φ = 102400819200.

The previous prime is 551251220483. The next prime is 551251220521. The reversal of 551251220520 is 25022152155.

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

It is not an unprimeable number, because it can be changed into a prime (551251220521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 852010837 + ... + 852011483.

It is an arithmetic number, because the mean of its divisors is an integer number (2237563440).

Almost surely, 2^551251220520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551251220520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1145632481280).

551251220520 is an abundant number, since it is smaller than the sum of its proper divisors (1740013742040).

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

551251220520 is a wasteful number, since it uses less digits than its factorization.

551251220520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

Adding to 551251220520 its reverse (25022152155), we get a palindrome (576273372675).

The spelling of 551251220520 in words is "five hundred fifty-one billion, two hundred fifty-one million, two hundred twenty thousand, five hundred twenty".