16513278621893 has 2 divisors, whose sum is σ = 16513278621894. Its totient is φ = 16513278621892.

The previous prime is 16513278621839. The next prime is 16513278621923. The reversal of 16513278621893 is 39812687231561.

Together with previous prime (16513278621839) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12653401494244 + 3859877127649 = 3557162^2 + 1964657^2 .

It is a cyclic number.

It is not a de Polignac number, because 16513278621893 - 2²² = 16513274427589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16513278621193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8256639310946 + 8256639310947.

It is an arithmetic number, because the mean of its divisors is an integer number (8256639310947).

Almost surely, 2^{16513278621893} is an apocalyptic number.

It is an amenable number.

16513278621893 is a deficient number, since it is larger than the sum of its proper divisors (1).

16513278621893 is an equidigital number, since it uses as much as digits as its factorization.

16513278621893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 62.

The spelling of 16513278621893 in words is "sixteen trillion, five hundred thirteen billion, two hundred seventy-eight million, six hundred twenty-one thousand, eight hundred ninety-three".