12385747481 has 2 divisors, whose sum is σ = 12385747482. Its totient is φ = 12385747480.

The previous prime is 12385747453. The next prime is 12385747487. The reversal of 12385747481 is 18474758321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12378565081 + 7182400 = 111259^2 + 2680^2 .

It is an emirp because it is prime and its reverse (18474758321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12385747481 is a prime.

It is a super-2 number, since 2×12385747481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12385747487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6192873740 + 6192873741.

It is an arithmetic number, because the mean of its divisors is an integer number (6192873741).

Almost surely, 2^12385747481 is an apocalyptic number.

It is an amenable number.

12385747481 is a deficient number, since it is larger than the sum of its proper divisors (1).

12385747481 is an equidigital number, since it uses as much as digits as its factorization.

12385747481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1505280, while the sum is 50.

The spelling of 12385747481 in words is "twelve billion, three hundred eighty-five million, seven hundred forty-seven thousand, four hundred eighty-one".