12781566068 has 6 divisors (see below), whose sum is σ = 22367740626. Its totient is φ = 6390783032.

The previous prime is 12781566029. The next prime is 12781566101. The reversal of 12781566068 is 86066518721.

It can be written as a sum of positive squares in only one way, i.e., 11393854564 + 1387711504 = 106742^2 + 37252^2 .

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, 1597695755 + ... + 1597695762.

It is an arithmetic number, because the mean of its divisors is an integer number (3727956771).

Almost surely, 2^12781566068 is an apocalyptic number.

It is an amenable number.

12781566068 is a deficient number, since it is larger than the sum of its proper divisors (9586174558).

12781566068 is a wasteful number, since it uses less digits than its factorization.

12781566068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3195391521 (or 3195391519 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 12781566068 in words is "twelve billion, seven hundred eighty-one million, five hundred sixty-six thousand, sixty-eight".