67662257809 has 2 divisors, whose sum is σ = 67662257810. Its totient is φ = 67662257808.

The previous prime is 67662257807. The next prime is 67662257813. The reversal of 67662257809 is 90875226676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67325718784 + 336539025 = 259472^2 + 18345^2 .

It is a cyclic number.

It is not a de Polignac number, because 67662257809 - 2¹ = 67662257807 is a prime.

It is a super-2 number, since 2×67662257809² (a number of 22 digits) contains 22 as substring.

Together with 67662257807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (67662257807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33831128904 + 33831128905.

It is an arithmetic number, because the mean of its divisors is an integer number (33831128905).

Almost surely, 2^67662257809 is an apocalyptic number.

It is an amenable number.

67662257809 is a deficient number, since it is larger than the sum of its proper divisors (1).

67662257809 is an equidigital number, since it uses as much as digits as its factorization.

67662257809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 58.

The spelling of 67662257809 in words is "sixty-seven billion, six hundred sixty-two million, two hundred fifty-seven thousand, eight hundred nine".