17985369569 has 2 divisors, whose sum is σ = 17985369570. Its totient is φ = 17985369568.

The previous prime is 17985369551. The next prime is 17985369629. The reversal of 17985369569 is 96596358971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14108688400 + 3876681169 = 118780^2 + 62263^2 .

It is a cyclic number.

It is not a de Polignac number, because 17985369569 - 2¹² = 17985365473 is a prime.

It is a super-2 number, since 2×17985369569² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 17985369499 and 17985369508.

It is not a weakly prime, because it can be changed into another prime (17985363569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8992684784 + 8992684785.

It is an arithmetic number, because the mean of its divisors is an integer number (8992684785).

Almost surely, 2^17985369569 is an apocalyptic number.

It is an amenable number.

17985369569 is a deficient number, since it is larger than the sum of its proper divisors (1).

17985369569 is an equidigital number, since it uses as much as digits as its factorization.

17985369569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110224800, while the sum is 68.

The spelling of 17985369569 in words is "seventeen billion, nine hundred eighty-five million, three hundred sixty-nine thousand, five hundred sixty-nine".