19857403513 has 2 divisors, whose sum is σ = 19857403514. Its totient is φ = 19857403512.

The previous prime is 19857403471. The next prime is 19857403541. The reversal of 19857403513 is 31530475891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18466635664 + 1390767849 = 135892^2 + 37293^2 .

It is a cyclic number.

It is not a de Polignac number, because 19857403513 - 2¹³ = 19857395321 is a prime.

It is not a weakly prime, because it can be changed into another prime (19857403583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9928701756 + 9928701757.

It is an arithmetic number, because the mean of its divisors is an integer number (9928701757).

Almost surely, 2^19857403513 is an apocalyptic number.

It is an amenable number.

19857403513 is a deficient number, since it is larger than the sum of its proper divisors (1).

19857403513 is an equidigital number, since it uses as much as digits as its factorization.

19857403513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 19857403513 in words is "nineteen billion, eight hundred fifty-seven million, four hundred three thousand, five hundred thirteen".