28166191247 has 2 divisors, whose sum is σ = 28166191248. Its totient is φ = 28166191246.

The previous prime is 28166191241. The next prime is 28166191259. The reversal of 28166191247 is 74219166182.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28166191247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28166191241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14083095623 + 14083095624.

It is an arithmetic number, because the mean of its divisors is an integer number (14083095624).

Almost surely, 2^28166191247 is an apocalyptic number.

28166191247 is a deficient number, since it is larger than the sum of its proper divisors (1).

28166191247 is an equidigital number, since it uses as much as digits as its factorization.

28166191247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The spelling of 28166191247 in words is "twenty-eight billion, one hundred sixty-six million, one hundred ninety-one thousand, two hundred forty-seven".