1555216560 has 120 divisors (see below), whose sum is σ = 5364187920. Its totient is φ = 403508736.

The previous prime is 1555216499. The next prime is 1555216571. The reversal of 1555216560 is 656125551.

1555216560 is a `hidden beast` number, since 15 + 5 + 521 + 65 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2550 + ... + 55829.

It is an arithmetic number, because the mean of its divisors is an integer number (44701566).

Almost surely, 2^1555216560 is an apocalyptic number.

1555216560 is a gapful number since it is divisible by the number (10) 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 1555216560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2682093960).

1555216560 is an abundant number, since it is smaller than the sum of its proper divisors (3808971360).

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

1555216560 is a wasteful number, since it uses less digits than its factorization.

1555216560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58435 (or 58426 counting only the distinct ones).

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

The square root of 1555216560 is about 39436.2341001268. The cubic root of 1555216560 is about 1158.5913737818.

The spelling of 1555216560 in words is "one billion, five hundred fifty-five million, two hundred sixteen thousand, five hundred sixty".