67778126513 has 2 divisors, whose sum is σ = 67778126514. Its totient is φ = 67778126512.

The previous prime is 67778126503. The next prime is 67778126567. The reversal of 67778126513 is 31562187776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60763729009 + 7014397504 = 246503^2 + 83752^2 .

It is a cyclic number.

It is not a de Polignac number, because 67778126513 - 2⁴ = 67778126497 is a prime.

It is a super-2 number, since 2×67778126513² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67778126503) 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, 33889063256 + 33889063257.

It is an arithmetic number, because the mean of its divisors is an integer number (33889063257).

Almost surely, 2^67778126513 is an apocalyptic number.

It is an amenable number.

67778126513 is a deficient number, since it is larger than the sum of its proper divisors (1).

67778126513 is an equidigital number, since it uses as much as digits as its factorization.

67778126513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2963520, while the sum is 53.

The spelling of 67778126513 in words is "sixty-seven billion, seven hundred seventy-eight million, one hundred twenty-six thousand, five hundred thirteen".