1566540361 has 8 divisors (see below), whose sum is σ = 1681412904. Its totient is φ = 1454192640.

The previous prime is 1566540347. The next prime is 1566540377. The reversal of 1566540361 is 1630456651.

It can be written as a sum of positive squares in 4 ways, for example, as 942490000 + 624050361 = 30700^2 + 24981^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1566540361 - 2⁷ = 1566540233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1566540361.

It is not an unprimeable number, because it can be changed into a prime (1566540461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629920 + ... + 632401.

It is an arithmetic number, because the mean of its divisors is an integer number (210176613).

Almost surely, 2^1566540361 is an apocalyptic number.

It is an amenable number.

1566540361 is a deficient number, since it is larger than the sum of its proper divisors (114872543).

1566540361 is a wasteful number, since it uses less digits than its factorization.

1566540361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262411.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1566540361 is about 39579.5447295696. The cubic root of 1566540361 is about 1161.3965445661.

The spelling of 1566540361 in words is "one billion, five hundred sixty-six million, five hundred forty thousand, three hundred sixty-one".