67268247521 has 2 divisors, whose sum is σ = 67268247522. Its totient is φ = 67268247520.

The previous prime is 67268247517. The next prime is 67268247569. The reversal of 67268247521 is 12574286276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66102981025 + 1165266496 = 257105^2 + 34136^2 .

It is a cyclic number.

It is not a de Polignac number, because 67268247521 - 2² = 67268247517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67268247521.

It is not a weakly prime, because it can be changed into another prime (67268247581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33634123760 + 33634123761.

It is an arithmetic number, because the mean of its divisors is an integer number (33634123761).

Almost surely, 2^67268247521 is an apocalyptic number.

It is an amenable number.

67268247521 is a deficient number, since it is larger than the sum of its proper divisors (1).

67268247521 is an equidigital number, since it uses as much as digits as its factorization.

67268247521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 50.

The spelling of 67268247521 in words is "sixty-seven billion, two hundred sixty-eight million, two hundred forty-seven thousand, five hundred twenty-one".