654044661 has 6 divisors (see below), whose sum is σ = 944731190. Its totient is φ = 436029768.

The previous prime is 654044659. The next prime is 654044693. The reversal of 654044661 is 166440456.

It can be written as a sum of positive squares in only one way, i.e., 649944036 + 4100625 = 25494^2 + 2025^2 .

It is not a de Polignac number, because 654044661 - 2¹ = 654044659 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654044161) 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, 36335806 + ... + 36335823.

Almost surely, 2^654044661 is an apocalyptic number.

It is an amenable number.

654044661 is a deficient number, since it is larger than the sum of its proper divisors (290686529).

654044661 is a wasteful number, since it uses less digits than its factorization.

654044661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72671635 (or 72671632 counting only the distinct ones).

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

The square root of 654044661 is about 25574.2968818304. The cubic root of 654044661 is about 868.0321316689.

The spelling of 654044661 in words is "six hundred fifty-four million, forty-four thousand, six hundred sixty-one".