12665586277 has 2 divisors, whose sum is σ = 12665586278. Its totient is φ = 12665586276.

The previous prime is 12665586259. The next prime is 12665586281. The reversal of 12665586277 is 77268556621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7542748801 + 5122837476 = 86849^2 + 71574^2 .

It is a cyclic number.

It is not a de Polignac number, because 12665586277 - 2⁷ = 12665586149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12665586287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6332793138 + 6332793139.

It is an arithmetic number, because the mean of its divisors is an integer number (6332793139).

Almost surely, 2^12665586277 is an apocalyptic number.

It is an amenable number.

12665586277 is a deficient number, since it is larger than the sum of its proper divisors (1).

12665586277 is an equidigital number, since it uses as much as digits as its factorization.

12665586277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8467200, while the sum is 55.

The spelling of 12665586277 in words is "twelve billion, six hundred sixty-five million, five hundred eighty-six thousand, two hundred seventy-seven".