551251020540 has 192 divisors, whose sum is σ = 1785204126720. Its totient is φ = 125610946560.

The previous prime is 551251020493. The next prime is 551251020581. The reversal of 551251020540 is 45020152155.

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

It is a junction number, because it is equal to n+sod(n) for n = 551251020498 and 551251020507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8641281 + ... + 8704839.

It is an arithmetic number, because the mean of its divisors is an integer number (9297938160).

Almost surely, 2^551251020540 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 551251020540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (892602063360).

551251020540 is an abundant number, since it is smaller than the sum of its proper divisors (1233953106180).

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

551251020540 is a wasteful number, since it uses less digits than its factorization.

551251020540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64372 (or 64370 counting only the distinct ones).

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

Adding to 551251020540 its reverse (45020152155), we get a palindrome (596271172695).

The spelling of 551251020540 in words is "five hundred fifty-one billion, two hundred fifty-one million, twenty thousand, five hundred forty".