66647246587 has 2 divisors, whose sum is σ = 66647246588. Its totient is φ = 66647246586.

The previous prime is 66647246531. The next prime is 66647246657. The reversal of 66647246587 is 78564274666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66647246587 - 2¹¹ = 66647244539 is a prime.

It is not a weakly prime, because it can be changed into another prime (66647246507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33323623293 + 33323623294.

It is an arithmetic number, because the mean of its divisors is an integer number (33323623294).

Almost surely, 2^66647246587 is an apocalyptic number.

66647246587 is a deficient number, since it is larger than the sum of its proper divisors (1).

66647246587 is an equidigital number, since it uses as much as digits as its factorization.

66647246587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81285120, while the sum is 61.

The spelling of 66647246587 in words is "sixty-six billion, six hundred forty-seven million, two hundred forty-six thousand, five hundred eighty-seven".