6656987 has 2 divisors, whose sum is σ = 6656988. Its totient is φ = 6656986.

The previous prime is 6656981. The next prime is 6657017. The reversal of 6656987 is 7896566.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6656987 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6656981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328493 + 3328494.

It is an arithmetic number, because the mean of its divisors is an integer number (3328494).

Almost surely, 2^6656987 is an apocalyptic number.

6656987 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656987 is an equidigital number, since it uses as much as digits as its factorization.

6656987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 6656987 is about 2580.1137571820. The cubic root of 6656987 is about 188.1160725042.

The spelling of 6656987 in words is "six million, six hundred fifty-six thousand, nine hundred eighty-seven".