656560987 has 2 divisors, whose sum is σ = 656560988. Its totient is φ = 656560986.

The previous prime is 656560981. The next prime is 656561011. The reversal of 656560987 is 789065656.

656560987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656560987 - 2¹⁹ = 656036699 is a prime.

It is not a weakly prime, because it can be changed into another prime (656560981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328280493 + 328280494.

It is an arithmetic number, because the mean of its divisors is an integer number (328280494).

Almost surely, 2^656560987 is an apocalyptic number.

656560987 is a deficient number, since it is larger than the sum of its proper divisors (1).

656560987 is an equidigital number, since it uses as much as digits as its factorization.

656560987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2721600, while the sum is 52.

The square root of 656560987 is about 25623.4460406870. The cubic root of 656560987 is about 869.1439092707.

The spelling of 656560987 in words is "six hundred fifty-six million, five hundred sixty thousand, nine hundred eighty-seven".