1566605560 has 64 divisors (see below), whose sum is σ = 3806812800. Its totient is φ = 576792576.

The previous prime is 1566605543. The next prime is 1566605563. The reversal of 1566605560 is 655066651.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566605563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186736 + ... + 194944.

It is an arithmetic number, because the mean of its divisors is an integer number (59481450).

Almost surely, 2^1566605560 is an apocalyptic number.

1566605560 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 1566605560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1903406400).

1566605560 is an abundant number, since it is smaller than the sum of its proper divisors (2240207240).

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

1566605560 is a wasteful number, since it uses less digits than its factorization.

1566605560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8600 (or 8596 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 1566605560 is about 39580.3683661484. The cubic root of 1566605560 is about 1161.4126566827.

The spelling of 1566605560 in words is "one billion, five hundred sixty-six million, six hundred five thousand, five hundred sixty".