12666777677 has 8 divisors (see below), whose sum is σ = 13008424632. Its totient is φ = 12326688000.

The previous prime is 12666777547. The next prime is 12666777713. The reversal of 12666777677 is 77677766621.

It can be written as a sum of positive squares in 4 ways, for example, as 630712996 + 12036064681 = 25114^2 + 109709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12666777677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666777077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372824 + ... + 405377.

It is an arithmetic number, because the mean of its divisors is an integer number (1626053079).

Almost surely, 2^12666777677 is an apocalyptic number.

It is an amenable number.

12666777677 is a deficient number, since it is larger than the sum of its proper divisors (341646955).

12666777677 is an equidigital number, since it uses as much as digits as its factorization.

12666777677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778639.

The product of its digits is 43563744, while the sum is 62.

The spelling of 12666777677 in words is "twelve billion, six hundred sixty-six million, seven hundred seventy-seven thousand, six hundred seventy-seven".