1566545640 has 128 divisors (see below), whose sum is σ = 5349888000. Its totient is φ = 363249920.

The previous prime is 1566545609. The next prime is 1566545713. The reversal of 1566545640 is 465456651.

It is a junction number, because it is equal to n+sod(n) for n = 1566545592 and 1566545601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4561 + ... + 56159.

It is an arithmetic number, because the mean of its divisors is an integer number (41796000).

Almost surely, 2^1566545640 is an apocalyptic number.

1566545640 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 1566545640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2674944000).

1566545640 is an abundant number, since it is smaller than the sum of its proper divisors (3783342360).

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

1566545640 is a wasteful number, since it uses less digits than its factorization.

1566545640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51647 (or 51643 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The square root of 1566545640 is about 39579.6114180016. The cubic root of 1566545640 is about 1161.3978491405.

The spelling of 1566545640 in words is "one billion, five hundred sixty-six million, five hundred forty-five thousand, six hundred forty".