1647220007659 has 2 divisors, whose sum is σ = 1647220007660. Its totient is φ = 1647220007658.

The previous prime is 1647220007633. The next prime is 1647220007689. The reversal of 1647220007659 is 9567000227461.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9567000227461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1647220007659 - 2¹⁵ = 1647219974891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1647220007689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823610003829 + 823610003830.

It is an arithmetic number, because the mean of its divisors is an integer number (823610003830).

Almost surely, 2^{1647220007659} is an apocalyptic number.

1647220007659 is a deficient number, since it is larger than the sum of its proper divisors (1).

1647220007659 is an equidigital number, since it uses as much as digits as its factorization.

1647220007659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 1647220007659 in words is "one trillion, six hundred forty-seven billion, two hundred twenty million, seven thousand, six hundred fifty-nine".