12645708387885 has 24 divisors (see below), whose sum is σ = 21920112900504. Its totient is φ = 6744105490560.

The previous prime is 12645708387827. The next prime is 12645708387889. The reversal of 12645708387885 is 58878380754621.

12645708387885 is a `hidden beast` number, since 1 + 26 + 457 + 0 + 8 + 3 + 8 + 78 + 85 = 666.

12645708387885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1156842220356 + 11488866167529 = 1075566^2 + 3389523^2 .

It is not a de Polignac number, because 12645708387885 - 2¹⁴ = 12645708371501 is a prime.

It is a super-2 number, since 2×12645708387885² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12645708387889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4543902 + ... + 6777791.

It is an arithmetic number, because the mean of its divisors is an integer number (913338037521).

Almost surely, 2^{12645708387885} is an apocalyptic number.

12645708387885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12645708387885 is a deficient number, since it is larger than the sum of its proper divisors (9274404512619).

12645708387885 is a wasteful number, since it uses less digits than its factorization.

12645708387885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11346525 (or 11346522 counting only the distinct ones).

The product of its (nonzero) digits is 722534400, while the sum is 72.

The spelling of 12645708387885 in words is "twelve trillion, six hundred forty-five billion, seven hundred eight million, three hundred eighty-seven thousand, eight hundred eighty-five".