12781164366 has 32 divisors (see below), whose sum is σ = 30073330080. Its totient is φ = 4009776768.

The previous prime is 12781164343. The next prime is 12781164367. The reversal of 12781164366 is 66346118721.

12781164366 is a `hidden beast` number, since 1 + 278 + 1 + 16 + 4 + 366 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781164367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6960501 + ... + 6962336.

It is an arithmetic number, because the mean of its divisors is an integer number (939791565).

Almost surely, 2^12781164366 is an apocalyptic number.

12781164366 is an abundant number, since it is smaller than the sum of its proper divisors (17292165714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12781164366 is a wasteful number, since it uses less digits than its factorization.

12781164366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13922865 (or 13922859 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

It can be divided in two parts, 12781 and 164366, that added together give a 11-th power (177147 = 3¹¹).

The spelling of 12781164366 in words is "twelve billion, seven hundred eighty-one million, one hundred sixty-four thousand, three hundred sixty-six".