550555561000 has 128 divisors (see below), whose sum is σ = 1327367676960. Its totient is φ = 213643008000.

The previous prime is 550555560983. The next prime is 550555561001. The reversal of 550555561000 is 165555055.

It can be written as a sum of positive squares in 16 ways, for example, as 251724965284 + 298830595716 = 501722^2 + 546654^2 .

It is a super-2 number, since 2×550555561000² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (550555561001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4391182 + ... + 4514818.

Almost surely, 2^550555561000 is an apocalyptic number.

550555561000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 550555561000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (663683838480).

550555561000 is an abundant number, since it is smaller than the sum of its proper divisors (776812115960).

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

550555561000 is a wasteful number, since it uses less digits than its factorization.

550555561000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123792 (or 123778 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 37.

The spelling of 550555561000 in words is "five hundred fifty billion, five hundred fifty-five million, five hundred sixty-one thousand".