18963818401513 has 2 divisors, whose sum is σ = 18963818401514. Its totient is φ = 18963818401512.

The previous prime is 18963818401471. The next prime is 18963818401579. The reversal of 18963818401513 is 31510481836981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9666179466304 + 9297638935209 = 3109048^2 + 3049203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18963818401513 is a prime.

It is not a weakly prime, because it can be changed into another prime (18963818401813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9481909200756 + 9481909200757.

It is an arithmetic number, because the mean of its divisors is an integer number (9481909200757).

Almost surely, 2^{18963818401513} is an apocalyptic number.

It is an amenable number.

18963818401513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18963818401513 is an equidigital number, since it uses as much as digits as its factorization.

18963818401513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 58.

The spelling of 18963818401513 in words is "eighteen trillion, nine hundred sixty-three billion, eight hundred eighteen million, four hundred one thousand, five hundred thirteen".