67268563721 has 2 divisors, whose sum is σ = 67268563722. Its totient is φ = 67268563720.

The previous prime is 67268563717. The next prime is 67268563781. The reversal of 67268563721 is 12736586276.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45678375625 + 21590188096 = 213725^2 + 146936^2 .

It is a cyclic number.

It is not a de Polignac number, because 67268563721 - 2² = 67268563717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (67268563781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33634281860 + 33634281861.

It is an arithmetic number, because the mean of its divisors is an integer number (33634281861).

Almost surely, 2^67268563721 is an apocalyptic number.

It is an amenable number.

67268563721 is a deficient number, since it is larger than the sum of its proper divisors (1).

67268563721 is an equidigital number, since it uses as much as digits as its factorization.

67268563721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 53.

The spelling of 67268563721 in words is "sixty-seven billion, two hundred sixty-eight million, five hundred sixty-three thousand, seven hundred twenty-one".