656104639 has 2 divisors, whose sum is σ = 656104640. Its totient is φ = 656104638.

The previous prime is 656104619. The next prime is 656104667. The reversal of 656104639 is 936401656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656104639 - 2¹³ = 656096447 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656104619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328052319 + 328052320.

It is an arithmetic number, because the mean of its divisors is an integer number (328052320).

Almost surely, 2^656104639 is an apocalyptic number.

656104639 is a deficient number, since it is larger than the sum of its proper divisors (1).

656104639 is an equidigital number, since it uses as much as digits as its factorization.

656104639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 656104639 is about 25614.5396015622. The cubic root of 656104639 is about 868.9424941079.

The spelling of 656104639 in words is "six hundred fifty-six million, one hundred four thousand, six hundred thirty-nine".