68345551 has 2 divisors, whose sum is σ = 68345552. Its totient is φ = 68345550.

The previous prime is 68345477. The next prime is 68345569. The reversal of 68345551 is 15554386.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68345551 is a prime.

It is a super-2 number, since 2×68345551² = 9342228682987202, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68345551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68345051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34172775 + 34172776.

It is an arithmetic number, because the mean of its divisors is an integer number (34172776).

Almost surely, 2^68345551 is an apocalyptic number.

68345551 is a deficient number, since it is larger than the sum of its proper divisors (1).

68345551 is an equidigital number, since it uses as much as digits as its factorization.

68345551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 37.

The square root of 68345551 is about 8267.1368078676. The cubic root of 68345551 is about 408.8557247238.

The spelling of 68345551 in words is "sixty-eight million, three hundred forty-five thousand, five hundred fifty-one".