654404661 has 6 divisors (see below), whose sum is σ = 945251190. Its totient is φ = 436269768.

The previous prime is 654404627. The next prime is 654404677. The reversal of 654404661 is 166404456.

It can be written as a sum of positive squares in only one way, i.e., 633528900 + 20875761 = 25170^2 + 4569^2 .

It is not a de Polignac number, because 654404661 - 2¹⁰ = 654403637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654404561) 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 5 ways as a sum of consecutive naturals, for example, 36355806 + ... + 36355823.

It is an arithmetic number, because the mean of its divisors is an integer number (157541865).

Almost surely, 2^654404661 is an apocalyptic number.

It is an amenable number.

654404661 is a deficient number, since it is larger than the sum of its proper divisors (290846529).

654404661 is a wasteful number, since it uses less digits than its factorization.

654404661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72711635 (or 72711632 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 654404661 is about 25581.3342302547. The cubic root of 654404661 is about 868.1913635326.

The spelling of 654404661 in words is "six hundred fifty-four million, four hundred four thousand, six hundred sixty-one".