68540569 has 2 divisors, whose sum is σ = 68540570. Its totient is φ = 68540568.

The previous prime is 68540567. The next prime is 68540573. The reversal of 68540569 is 96504586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64080025 + 4460544 = 8005^2 + 2112^2 .

It is a cyclic number.

It is not a de Polignac number, because 68540569 - 2¹ = 68540567 is a prime.

It is a super-2 number, since 2×68540569² = 9395619197687522, which contains 22 as substring.

Together with 68540567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68540567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34270284 + 34270285.

It is an arithmetic number, because the mean of its divisors is an integer number (34270285).

Almost surely, 2^68540569 is an apocalyptic number.

It is an amenable number.

68540569 is a deficient number, since it is larger than the sum of its proper divisors (1).

68540569 is an equidigital number, since it uses as much as digits as its factorization.

68540569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 68540569 is about 8278.9231787715. The cubic root of 68540569 is about 409.2442333458.

The spelling of 68540569 in words is "sixty-eight million, five hundred forty thousand, five hundred sixty-nine".