12267781568578 has 16 divisors (see below), whose sum is σ = 18411372339480. Its totient is φ = 6130657816576.

The previous prime is 12267781568551. The next prime is 12267781568591. The reversal of 12267781568578 is 87586518776221.

It can be written as a sum of positive squares in 4 ways, for example, as 9221650138089 + 3046131430489 = 3036717^2 + 1745317^2 .

It is a super-2 number, since 2×12267781568578² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12267781568578.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76260726 + ... + 76421422.

Almost surely, 2^{12267781568578} is an apocalyptic number.

12267781568578 is a deficient number, since it is larger than the sum of its proper divisors (6143590770902).

12267781568578 is a wasteful number, since it uses less digits than its factorization.

12267781568578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180581.

The product of its digits is 632217600, while the sum is 73.

The spelling of 12267781568578 in words is "twelve trillion, two hundred sixty-seven billion, seven hundred eighty-one million, five hundred sixty-eight thousand, five hundred seventy-eight".