28166127677 has 2 divisors, whose sum is σ = 28166127678. Its totient is φ = 28166127676.

The previous prime is 28166127623. The next prime is 28166127721. The reversal of 28166127677 is 77672166182.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18359979001 + 9806148676 = 135499^2 + 99026^2 .

It is a cyclic number.

It is not a de Polignac number, because 28166127677 - 2¹² = 28166123581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28166127277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14083063838 + 14083063839.

It is an arithmetic number, because the mean of its divisors is an integer number (14083063839).

Almost surely, 2^28166127677 is an apocalyptic number.

It is an amenable number.

28166127677 is a deficient number, since it is larger than the sum of its proper divisors (1).

28166127677 is an equidigital number, since it uses as much as digits as its factorization.

28166127677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2370816, while the sum is 53.

The spelling of 28166127677 in words is "twenty-eight billion, one hundred sixty-six million, one hundred twenty-seven thousand, six hundred seventy-seven".