12777777641 has 4 divisors (see below), whose sum is σ = 12824928384. Its totient is φ = 12730626900.

The previous prime is 12777777631. The next prime is 12777777671. The reversal of 12777777641 is 14677777721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14677777721 = 47 ⋅312293143.

It is a cyclic number.

It is not a de Polignac number, because 12777777641 - 2²⁶ = 12710668777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12777777611) 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, 23574965 + ... + 23575506.

It is an arithmetic number, because the mean of its divisors is an integer number (3206232096).

Almost surely, 2^12777777641 is an apocalyptic number.

It is an amenable number.

12777777641 is a deficient number, since it is larger than the sum of its proper divisors (47150743).

12777777641 is an equidigital number, since it uses as much as digits as its factorization.

12777777641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47150742.

The product of its digits is 5647152, while the sum is 56.

The spelling of 12777777641 in words is "twelve billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, six hundred forty-one".