19523944411649 has 2 divisors, whose sum is σ = 19523944411650. Its totient is φ = 19523944411648.

The previous prime is 19523944411637. The next prime is 19523944411667. The reversal of 19523944411649 is 94611444932591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16590836044225 + 2933108367424 = 4073185^2 + 1712632^2 .

It is a cyclic number.

It is not a de Polignac number, because 19523944411649 - 2²⁰ = 19523943363073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19523944411591 and 19523944411600.

It is not a weakly prime, because it can be changed into another prime (19523944411549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9761972205824 + 9761972205825.

It is an arithmetic number, because the mean of its divisors is an integer number (9761972205825).

Almost surely, 2^{19523944411649} is an apocalyptic number.

It is an amenable number.

19523944411649 is a deficient number, since it is larger than the sum of its proper divisors (1).

19523944411649 is an equidigital number, since it uses as much as digits as its factorization.

19523944411649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33592320, while the sum is 62.

The spelling of 19523944411649 in words is "nineteen trillion, five hundred twenty-three billion, nine hundred forty-four million, four hundred eleven thousand, six hundred forty-nine".