551321381160 has 576 divisors, whose sum is σ = 2084451408000. Its totient is φ = 125306265600.

The previous prime is 551321381137. The next prime is 551321381197. The reversal of 551321381160 is 61183123155.

It is a happy number.

551321381160 is a `hidden beast` number, since 5 + 513 + 2 + 1 + 3 + 81 + 1 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 355920066 + ... + 355921614.

It is an arithmetic number, because the mean of its divisors is an integer number (3618839250).

Almost surely, 2^551321381160 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 551321381160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1042225704000).

551321381160 is an abundant number, since it is smaller than the sum of its proper divisors (1533130026840).

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

551321381160 is a wasteful number, since it uses less digits than its factorization.

551321381160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922 (or 1898 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 551321381160 in words is "five hundred fifty-one billion, three hundred twenty-one million, three hundred eighty-one thousand, one hundred sixty".