67778345481 has 16 divisors (see below), whose sum is σ = 112670496768. Its totient is φ = 35209530000.

The previous prime is 67778345443. The next prime is 67778345497. The reversal of 67778345481 is 18454387776.

It is not a de Polignac number, because 67778345481 - 2⁷ = 67778345353 is a prime.

It is a super-2 number, since 2×67778345481² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67778345431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146706145 + ... + 146706606.

It is an arithmetic number, because the mean of its divisors is an integer number (7041906048).

Almost surely, 2^67778345481 is an apocalyptic number.

It is an amenable number.

67778345481 is a deficient number, since it is larger than the sum of its proper divisors (44892151287).

67778345481 is a wasteful number, since it uses less digits than its factorization.

67778345481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293412772.

The product of its digits is 31610880, while the sum is 60.

The spelling of 67778345481 in words is "sixty-seven billion, seven hundred seventy-eight million, three hundred forty-five thousand, four hundred eighty-one".