12662549777 has 4 divisors (see below), whose sum is σ = 12662776116. Its totient is φ = 12662323440.

The previous prime is 12662549771. The next prime is 12662549797. The reversal of 12662549777 is 77794526621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6416650816 + 6245898961 = 80104^2 + 79031^2 .

It is a cyclic number.

It is not a de Polignac number, because 12662549777 - 2⁴ = 12662549761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12662549771) 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, 38543 + ... + 163739.

It is an arithmetic number, because the mean of its divisors is an integer number (3165694029).

Almost surely, 2^12662549777 is an apocalyptic number.

It is an amenable number.

12662549777 is a deficient number, since it is larger than the sum of its proper divisors (226339).

12662549777 is a wasteful number, since it uses less digits than its factorization.

12662549777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226338.

The product of its digits is 8890560, while the sum is 56.

The spelling of 12662549777 in words is "twelve billion, six hundred sixty-two million, five hundred forty-nine thousand, seven hundred seventy-seven".