28155548173 has 2 divisors, whose sum is σ = 28155548174. Its totient is φ = 28155548172.

The previous prime is 28155548147. The next prime is 28155548203. The reversal of 28155548173 is 37184555182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27100402884 + 1055145289 = 164622^2 + 32483^2 .

It is a cyclic number.

It is not a de Polignac number, because 28155548173 - 2²⁵ = 28121993741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28155558173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14077774086 + 14077774087.

It is an arithmetic number, because the mean of its divisors is an integer number (14077774087).

Almost surely, 2^28155548173 is an apocalyptic number.

It is an amenable number.

28155548173 is a deficient number, since it is larger than the sum of its proper divisors (1).

28155548173 is an equidigital number, since it uses as much as digits as its factorization.

28155548173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344000, while the sum is 49.

The spelling of 28155548173 in words is "twenty-eight billion, one hundred fifty-five million, five hundred forty-eight thousand, one hundred seventy-three".