71144380778 has 16 divisors (see below), whose sum is σ = 108419498880. Its totient is φ = 35007482016.

The previous prime is 71144380777. The next prime is 71144380793. The reversal of 71144380778 is 87708344117.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71144380777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684851 + ... + 781862.

It is an arithmetic number, because the mean of its divisors is an integer number (6776218680).

Almost surely, 2^71144380778 is an apocalyptic number.

71144380778 is a deficient number, since it is larger than the sum of its proper divisors (37275118102).

71144380778 is a wasteful number, since it uses less digits than its factorization.

71144380778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467101.

The product of its (nonzero) digits is 1053696, while the sum is 50.

The spelling of 71144380778 in words is "seventy-one billion, one hundred forty-four million, three hundred eighty thousand, seven hundred seventy-eight".