28163742051661 has 2 divisors, whose sum is σ = 28163742051662. Its totient is φ = 28163742051660.

The previous prime is 28163742051629. The next prime is 28163742051703. The reversal of 28163742051661 is 16615024736182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27870015990436 + 293726061225 = 5279206^2 + 541965^2 .

It is a cyclic number.

It is not a de Polignac number, because 28163742051661 - 2⁵ = 28163742051629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28163742051599 and 28163742051608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28163742051611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14081871025830 + 14081871025831.

It is an arithmetic number, because the mean of its divisors is an integer number (14081871025831).

Almost surely, 2^{28163742051661} is an apocalyptic number.

It is an amenable number.

28163742051661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28163742051661 is an equidigital number, since it uses as much as digits as its factorization.

28163742051661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 28163742051661 in words is "twenty-eight trillion, one hundred sixty-three billion, seven hundred forty-two million, fifty-one thousand, six hundred sixty-one".