16813391513 has 2 divisors, whose sum is σ = 16813391514. Its totient is φ = 16813391512.

The previous prime is 16813391503. The next prime is 16813391521. The reversal of 16813391513 is 31519331861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14832073369 + 1981318144 = 121787^2 + 44512^2 .

It is a cyclic number.

It is not a de Polignac number, because 16813391513 - 2⁶ = 16813391449 is a prime.

It is not a weakly prime, because it can be changed into another prime (16813391503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8406695756 + 8406695757.

It is an arithmetic number, because the mean of its divisors is an integer number (8406695757).

Almost surely, 2^16813391513 is an apocalyptic number.

It is an amenable number.

16813391513 is a deficient number, since it is larger than the sum of its proper divisors (1).

16813391513 is an equidigital number, since it uses as much as digits as its factorization.

16813391513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 41.

The spelling of 16813391513 in words is "sixteen billion, eight hundred thirteen million, three hundred ninety-one thousand, five hundred thirteen".