654564661 has 4 divisors (see below), whose sum is σ = 655523712. Its totient is φ = 653605612.

The previous prime is 654564653. The next prime is 654564707. The reversal of 654564661 is 166465456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 654564661 - 2³ = 654564653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654564601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478501 + ... + 479866.

It is an arithmetic number, because the mean of its divisors is an integer number (163880928).

Almost surely, 2^654564661 is an apocalyptic number.

It is an amenable number.

654564661 is a deficient number, since it is larger than the sum of its proper divisors (959051).

654564661 is an equidigital number, since it uses as much as digits as its factorization.

654564661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959050.

The product of its digits is 518400, while the sum is 43.

The square root of 654564661 is about 25584.4613193243. The cubic root of 654564661 is about 868.2621145051.

The spelling of 654564661 in words is "six hundred fifty-four million, five hundred sixty-four thousand, six hundred sixty-one".