12771779205 has 32 divisors (see below), whose sum is σ = 20571782400. Its totient is φ = 6766087680.

The previous prime is 12771779113. The next prime is 12771779213. The reversal of 12771779205 is 50297717721.

It is not a de Polignac number, because 12771779205 - 2⁹ = 12771778693 is a prime.

It is a super-2 number, since 2×12771779205² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1969849 + ... + 1976321.

It is an arithmetic number, because the mean of its divisors is an integer number (642868200).

Almost surely, 2^12771779205 is an apocalyptic number.

12771779205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12771779205 is a deficient number, since it is larger than the sum of its proper divisors (7800003195).

12771779205 is a wasteful number, since it uses less digits than its factorization.

12771779205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7341.

The product of its (nonzero) digits is 432180, while the sum is 48.

The spelling of 12771779205 in words is "twelve billion, seven hundred seventy-one million, seven hundred seventy-nine thousand, two hundred five".