12777587607209 has 4 divisors (see below), whose sum is σ = 12921156007380. Its totient is φ = 12634019207040.

The previous prime is 12777587607149. The next prime is 12777587607221. The reversal of 12777587607209 is 90270678577721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 747809857600 + 12029777749609 = 864760^2 + 3468397^2 .

It is a cyclic number.

It is not a de Polignac number, because 12777587607209 - 2¹² = 12777587603113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12777587607229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71784199952 + ... + 71784200129.

It is an arithmetic number, because the mean of its divisors is an integer number (3230289001845).

Almost surely, 2^{12777587607209} is an apocalyptic number.

It is an amenable number.

12777587607209 is a deficient number, since it is larger than the sum of its proper divisors (143568400171).

12777587607209 is an equidigital number, since it uses as much as digits as its factorization.

12777587607209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143568400170.

The product of its (nonzero) digits is 145212480, while the sum is 68.

The spelling of 12777587607209 in words is "twelve trillion, seven hundred seventy-seven billion, five hundred eighty-seven million, six hundred seven thousand, two hundred nine".