16513112482781 has 2 divisors, whose sum is σ = 16513112482782. Its totient is φ = 16513112482780.

The previous prime is 16513112482777. The next prime is 16513112482829. The reversal of 16513112482781 is 18728421131561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16499762760100 + 13349722681 = 4061990^2 + 115541^2 .

It is a cyclic number.

It is not a de Polignac number, because 16513112482781 - 2² = 16513112482777 is a prime.

It is a super-2 number, since 2×16513112482781² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16513112482771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8256556241390 + 8256556241391.

It is an arithmetic number, because the mean of its divisors is an integer number (8256556241391).

Almost surely, 2^{16513112482781} is an apocalyptic number.

It is an amenable number.

16513112482781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16513112482781 is an equidigital number, since it uses as much as digits as its factorization.

16513112482781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 50.

The spelling of 16513112482781 in words is "sixteen trillion, five hundred thirteen billion, one hundred twelve million, four hundred eighty-two thousand, seven hundred eighty-one".