551609009280 has 1152 divisors, whose sum is σ = 2413484424000. Its totient is φ = 115294814208.

The previous prime is 551609009257. The next prime is 551609009323. The reversal of 551609009280 is 82900906155.

551609009280 is a `hidden beast` number, since 551 + 6 + 0 + 9 + 0 + 0 + 92 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a super-2 number, since 2×551609009280² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 155512467 + ... + 155516013.

Almost surely, 2^551609009280 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 551609009280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1206742212000).

551609009280 is an abundant number, since it is smaller than the sum of its proper divisors (1861875414720).

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

551609009280 is a wasteful number, since it uses less digits than its factorization.

551609009280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3634 (or 3612 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 551609009280 in words is "five hundred fifty-one billion, six hundred nine million, nine thousand, two hundred eighty".