1555666560 has 384 divisors, whose sum is σ = 6371164800. Its totient is φ = 355332096.

The previous prime is 1555666531. The next prime is 1555666579. The reversal of 1555666560 is 656665551.

It is a tau number, because it is divible by the number of its divisors (384).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1087926 + ... + 1089354.

It is an arithmetic number, because the mean of its divisors is an integer number (16591575).

Almost surely, 2^1555666560 is an apocalyptic number.

1555666560 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 1555666560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3185582400).

1555666560 is an abundant number, since it is smaller than the sum of its proper divisors (4815498240).

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

1555666560 is an equidigital number, since it uses as much as digits as its factorization.

1555666560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470 (or 1446 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The square root of 1555666560 is about 39441.9391004043. The cubic root of 1555666560 is about 1158.7031086690.

The spelling of 1555666560 in words is "one billion, five hundred fifty-five million, six hundred sixty-six thousand, five hundred sixty".