12788649977 has 2 divisors, whose sum is σ = 12788649978. Its totient is φ = 12788649976.

The previous prime is 12788649967. The next prime is 12788650019. The reversal of 12788649977 is 77994688721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9775079161 + 3013570816 = 98869^2 + 54896^2 .

It is a cyclic number.

It is not a de Polignac number, because 12788649977 - 2¹⁴ = 12788633593 is a prime.

It is not a weakly prime, because it can be changed into another prime (12788649947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6394324988 + 6394324989.

It is an arithmetic number, because the mean of its divisors is an integer number (6394324989).

Almost surely, 2^12788649977 is an apocalyptic number.

It is an amenable number.

12788649977 is a deficient number, since it is larger than the sum of its proper divisors (1).

12788649977 is an equidigital number, since it uses as much as digits as its factorization.

12788649977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 85349376, while the sum is 68.

The spelling of 12788649977 in words is "twelve billion, seven hundred eighty-eight million, six hundred forty-nine thousand, nine hundred seventy-seven".