1663641017 has 2 divisors, whose sum is σ = 1663641018. Its totient is φ = 1663641016.

The previous prime is 1663640987. The next prime is 1663641053. The reversal of 1663641017 is 7101463661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1116829561 + 546811456 = 33419^2 + 23384^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663641017 - 2¹² = 1663636921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1663649017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831820508 + 831820509.

It is an arithmetic number, because the mean of its divisors is an integer number (831820509).

Almost surely, 2^1663641017 is an apocalyptic number.

It is an amenable number.

1663641017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663641017 is an equidigital number, since it uses as much as digits as its factorization.

1663641017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 1663641017 is about 40787.7557239915. The cubic root of 1663641017 is about 1184.9132060318.

The spelling of 1663641017 in words is "one billion, six hundred sixty-three million, six hundred forty-one thousand, seventeen".