555561216 has 432 divisors, whose sum is σ = 2019472000. Its totient is φ = 146313216.

The previous prime is 555561191. The next prime is 555561217. The reversal of 555561216 is 612165555.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555561217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15015150 + ... + 15015186.

Almost surely, 2^555561216 is an apocalyptic number.

555561216 is a gapful number since it is divisible by the number (56) 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 555561216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1009736000).

555561216 is an abundant number, since it is smaller than the sum of its proper divisors (1463910784).

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

555561216 is a wasteful number, since it uses less digits than its factorization.

555561216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 68 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 555561216 is about 23570.3461154053. The cubic root of 555561216 is about 822.0734834053.

The spelling of 555561216 in words is "five hundred fifty-five million, five hundred sixty-one thousand, two hundred sixteen".