12381720553 has 2 divisors, whose sum is σ = 12381720554. Its totient is φ = 12381720552.

The previous prime is 12381720539. The next prime is 12381720577. The reversal of 12381720553 is 35502718321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12372557824 + 9162729 = 111232^2 + 3027^2 .

It is a cyclic number.

It is not a de Polignac number, because 12381720553 - 2⁵ = 12381720521 is a prime.

It is not a weakly prime, because it can be changed into another prime (12381723553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6190860276 + 6190860277.

It is an arithmetic number, because the mean of its divisors is an integer number (6190860277).

Almost surely, 2^12381720553 is an apocalyptic number.

It is an amenable number.

12381720553 is a deficient number, since it is larger than the sum of its proper divisors (1).

12381720553 is an equidigital number, since it uses as much as digits as its factorization.

12381720553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 12381720553 in words is "twelve billion, three hundred eighty-one million, seven hundred twenty thousand, five hundred fifty-three".