1553221560 has 128 divisors (see below), whose sum is σ = 5155176960. Its totient is φ = 371212800.

The previous prime is 1553221559. The next prime is 1553221577. The reversal of 1553221560 is 651223551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85434 + ... + 102006.

It is an arithmetic number, because the mean of its divisors is an integer number (40274820).

Almost surely, 2^1553221560 is an apocalyptic number.

1553221560 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 1553221560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2577588480).

1553221560 is an abundant number, since it is smaller than the sum of its proper divisors (3601955400).

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

1553221560 is a wasteful number, since it uses less digits than its factorization.

1553221560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16669 (or 16665 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 1553221560 is about 39410.9319859351. The cubic root of 1553221560 is about 1158.0957560246.

The spelling of 1553221560 in words is "one billion, five hundred fifty-three million, two hundred twenty-one thousand, five hundred sixty".