12978578068 has 6 divisors (see below), whose sum is σ = 22712511626. Its totient is φ = 6489289032.

The previous prime is 12978578059. The next prime is 12978578087. The reversal of 12978578068 is 86087587921.

It can be written as a sum of positive squares in only one way, i.e., 10815584004 + 2162994064 = 103998^2 + 46508^2 .

It is a super-2 number, since 2×12978578068² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12978577997 and 12978578015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1622322255 + ... + 1622322262.

Almost surely, 2^12978578068 is an apocalyptic number.

It is an amenable number.

12978578068 is a deficient number, since it is larger than the sum of its proper divisors (9733933558).

12978578068 is a wasteful number, since it uses less digits than its factorization.

12978578068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244644521 (or 3244644519 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 61.

The spelling of 12978578068 in words is "twelve billion, nine hundred seventy-eight million, five hundred seventy-eight thousand, sixty-eight".