68816569 has 2 divisors, whose sum is σ = 68816570. Its totient is φ = 68816568.

The previous prime is 68816563. The next prime is 68816609. The reversal of 68816569 is 96561886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45050944 + 23765625 = 6712^2 + 4875^2 .

It is a cyclic number.

It is not a de Polignac number, because 68816569 - 2⁷ = 68816441 is a prime.

It is a super-2 number, since 2×68816569² = 9471440337863522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68816563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34408284 + 34408285.

It is an arithmetic number, because the mean of its divisors is an integer number (34408285).

Almost surely, 2^68816569 is an apocalyptic number.

It is an amenable number.

68816569 is a deficient number, since it is larger than the sum of its proper divisors (1).

68816569 is an equidigital number, since it uses as much as digits as its factorization.

68816569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 49.

The square root of 68816569 is about 8295.5752663694. The cubic root of 68816569 is about 409.7928142177.

The spelling of 68816569 in words is "sixty-eight million, eight hundred sixteen thousand, five hundred sixty-nine".