6985388569 has 2 divisors, whose sum is σ = 6985388570. Its totient is φ = 6985388568.

The previous prime is 6985388477. The next prime is 6985388593. The reversal of 6985388569 is 9658835896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6144678544 + 840710025 = 78388^2 + 28995^2 .

It is a cyclic number.

It is not a de Polignac number, because 6985388569 - 2¹⁵ = 6985355801 is a prime.

It is a super-2 number, since 2×6985388569² = 97591306919831735522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6985388269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3492694284 + 3492694285.

It is an arithmetic number, because the mean of its divisors is an integer number (3492694285).

Almost surely, 2^6985388569 is an apocalyptic number.

It is an amenable number.

6985388569 is a deficient number, since it is larger than the sum of its proper divisors (1).

6985388569 is an equidigital number, since it uses as much as digits as its factorization.

6985388569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111974400, while the sum is 67.

The square root of 6985388569 is about 83578.6370372238. The cubic root of 6985388569 is about 1911.5992717177.

The spelling of 6985388569 in words is "six billion, nine hundred eighty-five million, three hundred eighty-eight thousand, five hundred sixty-nine".