17990664563 has 2 divisors, whose sum is σ = 17990664564. Its totient is φ = 17990664562.

The previous prime is 17990664529. The next prime is 17990664581. The reversal of 17990664563 is 36546609971.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17990664563 - 2³⁰ = 16916922739 is a prime.

It is a super-2 number, since 2×17990664563² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 17990664499 and 17990664508.

It is not a weakly prime, because it can be changed into another prime (17990664863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8995332281 + 8995332282.

It is an arithmetic number, because the mean of its divisors is an integer number (8995332282).

Almost surely, 2^17990664563 is an apocalyptic number.

17990664563 is a deficient number, since it is larger than the sum of its proper divisors (1).

17990664563 is an equidigital number, since it uses as much as digits as its factorization.

17990664563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7348320, while the sum is 56.

The spelling of 17990664563 in words is "seventeen billion, nine hundred ninety million, six hundred sixty-four thousand, five hundred sixty-three".