12315371777 has 2 divisors, whose sum is σ = 12315371778. Its totient is φ = 12315371776.

The previous prime is 12315371771. The next prime is 12315371791. The reversal of 12315371777 is 77717351321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12082626241 + 232745536 = 109921^2 + 15256^2 .

It is an emirp because it is prime and its reverse (77717351321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12315371777 - 2²⁶ = 12248262913 is a prime.

It is not a weakly prime, because it can be changed into another prime (12315371771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6157685888 + 6157685889.

It is an arithmetic number, because the mean of its divisors is an integer number (6157685889).

Almost surely, 2^12315371777 is an apocalyptic number.

It is an amenable number.

12315371777 is a deficient number, since it is larger than the sum of its proper divisors (1).

12315371777 is an equidigital number, since it uses as much as digits as its factorization.

12315371777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216090, while the sum is 44.

The spelling of 12315371777 in words is "twelve billion, three hundred fifteen million, three hundred seventy-one thousand, seven hundred seventy-seven".