68698561 has 2 divisors, whose sum is σ = 68698562. Its totient is φ = 68698560.

The previous prime is 68698559. The next prime is 68698579. The reversal of 68698561 is 16589686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68145025 + 553536 = 8255^2 + 744^2 .

It is a cyclic number.

It is not a de Polignac number, because 68698561 - 2¹ = 68698559 is a prime.

Together with 68698559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68698541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34349280 + 34349281.

It is an arithmetic number, because the mean of its divisors is an integer number (34349281).

Almost surely, 2^68698561 is an apocalyptic number.

It is an amenable number.

68698561 is a deficient number, since it is larger than the sum of its proper divisors (1).

68698561 is an equidigital number, since it uses as much as digits as its factorization.

68698561 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 68698561 is about 8288.4595070495. The cubic root of 68698561 is about 409.5584399494.

The spelling of 68698561 in words is "sixty-eight million, six hundred ninety-eight thousand, five hundred sixty-one".