12777525977 has 4 divisors (see below), whose sum is σ = 12789707700. Its totient is φ = 12765344256.

The previous prime is 12777525931. The next prime is 12777525989. The reversal of 12777525977 is 77952577721.

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 6722196121 + 6055329856 = 81989^2 + 77816^2 .

It is a cyclic number.

It is not a de Polignac number, because 12777525977 - 2¹⁰ = 12777524953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12777525997) 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, 6089288 + ... + 6091385.

It is an arithmetic number, because the mean of its divisors is an integer number (3197426925).

Almost surely, 2^12777525977 is an apocalyptic number.

It is an amenable number.

12777525977 is a deficient number, since it is larger than the sum of its proper divisors (12181723).

12777525977 is a wasteful number, since it uses less digits than its factorization.

12777525977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12181722.

The product of its digits is 15126300, while the sum is 59.

The spelling of 12777525977 in words is "twelve billion, seven hundred seventy-seven million, five hundred twenty-five thousand, nine hundred seventy-seven".