28351788106661 has 2 divisors, whose sum is σ = 28351788106662. Its totient is φ = 28351788106660.

The previous prime is 28351788106643. The next prime is 28351788106709. The reversal of 28351788106661 is 16660188715382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15524151604900 + 12827636501761 = 3940070^2 + 3581569^2 .

It is a cyclic number.

It is not a de Polignac number, because 28351788106661 - 2¹⁴ = 28351788090277 is a prime.

It is a super-2 number, since 2×28351788106661² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28351788106594 and 28351788106603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28351788106861) 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, 14175894053330 + 14175894053331.

It is an arithmetic number, because the mean of its divisors is an integer number (14175894053331).

Almost surely, 2^{28351788106661} is an apocalyptic number.

It is an amenable number.

28351788106661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28351788106661 is an equidigital number, since it uses as much as digits as its factorization.

28351788106661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23224320, while the sum is 62.

The spelling of 28351788106661 in words is "twenty-eight trillion, three hundred fifty-one billion, seven hundred eighty-eight million, one hundred six thousand, six hundred sixty-one".