654640641 has 12 divisors (see below), whose sum is σ = 1001215332. Its totient is φ = 410754816.

The previous prime is 654640639. The next prime is 654640673. The reversal of 654640641 is 146046456.

654640641 is a `hidden beast` number, since 6 + 5 + 4 + 6 + 4 + 0 + 641 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 585833616 + 68807025 = 24204^2 + 8295^2 .

It is not a de Polignac number, because 654640641 - 2¹ = 654640639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 654640596 and 654640605.

It is not an unprimeable number, because it can be changed into a prime (654640621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2139196 + ... + 2139501.

It is an arithmetic number, because the mean of its divisors is an integer number (83434611).

Almost surely, 2^654640641 is an apocalyptic number.

It is an amenable number.

654640641 is a deficient number, since it is larger than the sum of its proper divisors (346574691).

654640641 is a wasteful number, since it uses less digits than its factorization.

654640641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4278720 (or 4278717 counting only the distinct ones).

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

The square root of 654640641 is about 25585.9461619069. The cubic root of 654640641 is about 868.2957083358.

The spelling of 654640641 in words is "six hundred fifty-four million, six hundred forty thousand, six hundred forty-one".