551980645920 has 864 divisors, whose sum is σ = 2202995418624. Its totient is φ = 125325066240.

The previous prime is 551980645913. The next prime is 551980645921. The reversal of 551980645920 is 29546089155.

551980645920 is a `hidden beast` number, since 5 + 519 + 80 + 6 + 45 + 9 + 2 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (551980645921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 909358257 + ... + 909358863.

It is an arithmetic number, because the mean of its divisors is an integer number (2549763216).

Almost surely, 2^551980645920 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 551980645920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1101497709312).

551980645920 is an abundant number, since it is smaller than the sum of its proper divisors (1651014772704).

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

551980645920 is a wasteful number, since it uses less digits than its factorization.

551980645920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974 (or 952 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 54.

The spelling of 551980645920 in words is "five hundred fifty-one billion, nine hundred eighty million, six hundred forty-five thousand, nine hundred twenty".