551551680 has 336 divisors, whose sum is σ = 2027005344. Its totient is φ = 142663680.

The previous prime is 551551613. The next prime is 551551681. The reversal of 551551680 is 86155155.

551551680 is a `hidden beast` number, since 55 + 15 + 516 + 80 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (551551681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3188074 + ... + 3188246.

It is an arithmetic number, because the mean of its divisors is an integer number (6032754).

Almost surely, 2^551551680 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 551551680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1013502672).

551551680 is an abundant number, since it is smaller than the sum of its proper divisors (1475453664).

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

551551680 is a wasteful number, since it uses less digits than its factorization.

551551680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 36.

The square root of 551551680 is about 23485.1374277435. The cubic root of 551551680 is about 820.0910468010.

551551680 divided by its sum of digits (36) gives a triangular number (15320880 = T₅₅₃₅).

The spelling of 551551680 in words is "five hundred fifty-one million, five hundred fifty-one thousand, six hundred eighty".