28250122661 has 2 divisors, whose sum is σ = 28250122662. Its totient is φ = 28250122660.

The previous prime is 28250122643. The next prime is 28250122687. The reversal of 28250122661 is 16622105282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27683968225 + 566154436 = 166385^2 + 23794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28250122661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28250122601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14125061330 + 14125061331.

It is an arithmetic number, because the mean of its divisors is an integer number (14125061331).

Almost surely, 2^28250122661 is an apocalyptic number.

It is an amenable number.

28250122661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28250122661 is an equidigital number, since it uses as much as digits as its factorization.

28250122661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 28250122661 in words is "twenty-eight billion, two hundred fifty million, one hundred twenty-two thousand, six hundred sixty-one".