6566940487 has 2 divisors, whose sum is σ = 6566940488. Its totient is φ = 6566940486.

The previous prime is 6566940481. The next prime is 6566940539. The reversal of 6566940487 is 7840496656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6566940487 - 2¹⁵ = 6566907719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6566940481) 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, 3283470243 + 3283470244.

It is an arithmetic number, because the mean of its divisors is an integer number (3283470244).

Almost surely, 2^6566940487 is an apocalyptic number.

6566940487 is a deficient number, since it is larger than the sum of its proper divisors (1).

6566940487 is an equidigital number, since it uses as much as digits as its factorization.

6566940487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The square root of 6566940487 is about 81036.6613761944. The cubic root of 6566940487 is about 1872.6402776662.

The spelling of 6566940487 in words is "six billion, five hundred sixty-six million, nine hundred forty thousand, four hundred eighty-seven".