6660301561 has 6 divisors (see below), whose sum is σ = 6735985262. Its totient is φ = 6585458880.

The previous prime is 6660301537. The next prime is 6660301573. The reversal of 6660301561 is 1651030666.

It can be written as a sum of positive squares in 3 ways, for example, as 374190336 + 6286111225 = 19344^2 + 79285^2 .

It is not a de Polignac number, because 6660301561 - 2²⁷ = 6526083833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6660301861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 412500 + ... + 428341.

Almost surely, 2^6660301561 is an apocalyptic number.

It is an amenable number.

6660301561 is a deficient number, since it is larger than the sum of its proper divisors (75683701).

6660301561 is an frugal number, since it uses more digits than its factorization.

6660301561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841019 (or 840930 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 6660301561 is about 81610.6706319707. The cubic root of 6660301561 is about 1881.4728876565.

The spelling of 6660301561 in words is "six billion, six hundred sixty million, three hundred one thousand, five hundred sixty-one".