28618111693 has 2 divisors, whose sum is σ = 28618111694. Its totient is φ = 28618111692.

The previous prime is 28618111633. The next prime is 28618111727. The reversal of 28618111693 is 39611181682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25272414729 + 3345696964 = 158973^2 + 57842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28618111693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28618111633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14309055846 + 14309055847.

It is an arithmetic number, because the mean of its divisors is an integer number (14309055847).

Almost surely, 2^28618111693 is an apocalyptic number.

It is an amenable number.

28618111693 is a deficient number, since it is larger than the sum of its proper divisors (1).

28618111693 is an equidigital number, since it uses as much as digits as its factorization.

28618111693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 46.

The spelling of 28618111693 in words is "twenty-eight billion, six hundred eighteen million, one hundred eleven thousand, six hundred ninety-three".