654616643 has 4 divisors (see below), whose sum is σ = 655929000. Its totient is φ = 653304288.

The previous prime is 654616631. The next prime is 654616661. The reversal of 654616643 is 346616456.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 654616643 - 2⁶ = 654616579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 654616643.

It is not an unprimeable number, because it can be changed into a prime (654616343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655430 + ... + 656427.

It is an arithmetic number, because the mean of its divisors is an integer number (163982250).

Almost surely, 2^654616643 is an apocalyptic number.

654616643 is a deficient number, since it is larger than the sum of its proper divisors (1312357).

654616643 is a wasteful number, since it uses less digits than its factorization.

654616643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312356.

The product of its digits is 311040, while the sum is 41.

The square root of 654616643 is about 25585.4771892181. The cubic root of 654616643 is about 868.2850981303.

The spelling of 654616643 in words is "six hundred fifty-four million, six hundred sixteen thousand, six hundred forty-three".