68455559 has 2 divisors, whose sum is σ = 68455560. Its totient is φ = 68455558.

The previous prime is 68455529. The next prime is 68455561. The reversal of 68455559 is 95555486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68455559 - 2²⁴ = 51678343 is a prime.

It is a Sophie Germain prime.

Together with 68455561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68455529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34227779 + 34227780.

It is an arithmetic number, because the mean of its divisors is an integer number (34227780).

Almost surely, 2^68455559 is an apocalyptic number.

68455559 is a deficient number, since it is larger than the sum of its proper divisors (1).

68455559 is an equidigital number, since it uses as much as digits as its factorization.

68455559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080000, while the sum is 47.

The square root of 68455559 is about 8273.7874640336. The cubic root of 68455559 is about 409.0749698676.

The spelling of 68455559 in words is "sixty-eight million, four hundred fifty-five thousand, five hundred fifty-nine".