12777077571 has 4 divisors (see below), whose sum is σ = 17036103432. Its totient is φ = 8518051712.

The previous prime is 12777077567. The next prime is 12777077581. The reversal of 12777077571 is 17577077721.

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

It is a cyclic number.

It is not a de Polignac number, because 12777077571 - 2² = 12777077567 is a prime.

It is a super-2 number, since 2×12777077571² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12777077531) 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 3 ways as a sum of consecutive naturals, for example, 2129512926 + ... + 2129512931.

It is an arithmetic number, because the mean of its divisors is an integer number (4259025858).

Almost surely, 2^12777077571 is an apocalyptic number.

12777077571 is a deficient number, since it is larger than the sum of its proper divisors (4259025861).

12777077571 is an equidigital number, since it uses as much as digits as its factorization.

12777077571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4259025860.

The product of its (nonzero) digits is 1176490, while the sum is 51.

The spelling of 12777077571 in words is "twelve billion, seven hundred seventy-seven million, seventy-seven thousand, five hundred seventy-one".