656987687 has 2 divisors, whose sum is σ = 656987688. Its totient is φ = 656987686.

The previous prime is 656987677. The next prime is 656987777. The reversal of 656987687 is 786789656.

It is a happy number.

656987687 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 656987687 - 2²⁶ = 589878823 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 (656987657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328493843 + 328493844.

It is an arithmetic number, because the mean of its divisors is an integer number (328493844).

Almost surely, 2^656987687 is an apocalyptic number.

656987687 is a deficient number, since it is larger than the sum of its proper divisors (1).

656987687 is an equidigital number, since it uses as much as digits as its factorization.

656987687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30481920, while the sum is 62.

The square root of 656987687 is about 25631.7710468863. The cubic root of 656987687 is about 869.3321544862.

The spelling of 656987687 in words is "six hundred fifty-six million, nine hundred eighty-seven thousand, six hundred eighty-seven".