804542661 has 12 divisors (see below), whose sum is σ = 1251510988. Its totient is φ = 495103104.

The previous prime is 804542653. The next prime is 804542699. The reversal of 804542661 is 166245408.

It can be written as a sum of positive squares in 2 ways, for example, as 187964100 + 616578561 = 13710^2 + 24831^2 .

It is not a de Polignac number, because 804542661 - 2³ = 804542653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (804542611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3438100 + ... + 3438333.

Almost surely, 2^804542661 is an apocalyptic number.

It is an amenable number.

804542661 is a deficient number, since it is larger than the sum of its proper divisors (446968327).

804542661 is a wasteful number, since it uses less digits than its factorization.

804542661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6876452 (or 6876449 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 804542661 is about 28364.4612323238. The cubic root of 804542661 is about 930.0715484322.

The spelling of 804542661 in words is "eight hundred four million, five hundred forty-two thousand, six hundred sixty-one".