11781425897 has 2 divisors, whose sum is σ = 11781425898. Its totient is φ = 11781425896.

The previous prime is 11781425863. The next prime is 11781425917. The reversal of 11781425897 is 79852418711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9685709056 + 2095716841 = 98416^2 + 45779^2 .

It is a cyclic number.

It is not a de Polignac number, because 11781425897 - 2¹² = 11781421801 is a prime.

It is not a weakly prime, because it can be changed into another prime (11781425297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5890712948 + 5890712949.

It is an arithmetic number, because the mean of its divisors is an integer number (5890712949).

Almost surely, 2^11781425897 is an apocalyptic number.

It is an amenable number.

11781425897 is a deficient number, since it is larger than the sum of its proper divisors (1).

11781425897 is an equidigital number, since it uses as much as digits as its factorization.

11781425897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 53.

The spelling of 11781425897 in words is "eleven billion, seven hundred eighty-one million, four hundred twenty-five thousand, eight hundred ninety-seven".