67268563781 has 2 divisors, whose sum is σ = 67268563782. Its totient is φ = 67268563780.

The previous prime is 67268563721. The next prime is 67268563787. The reversal of 67268563781 is 18736586276.

67268563781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66233654881 + 1034908900 = 257359^2 + 32170^2 .

It is a cyclic number.

It is not a de Polignac number, because 67268563781 - 2⁶ = 67268563717 is a prime.

It is a super-2 number, since 2×67268563781² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 67268563781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67268563787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33634281890 + 33634281891.

It is an arithmetic number, because the mean of its divisors is an integer number (33634281891).

Almost surely, 2^67268563781 is an apocalyptic number.

It is an amenable number.

67268563781 is a deficient number, since it is larger than the sum of its proper divisors (1).

67268563781 is an equidigital number, since it uses as much as digits as its factorization.

67268563781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 59.

The spelling of 67268563781 in words is "sixty-seven billion, two hundred sixty-eight million, five hundred sixty-three thousand, seven hundred eighty-one".