28566453661 has 2 divisors, whose sum is σ = 28566453662. Its totient is φ = 28566453660.

The previous prime is 28566453653. The next prime is 28566453673. The reversal of 28566453661 is 16635466582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28390228036 + 176225625 = 168494^2 + 13275^2 .

It is a cyclic number.

It is not a de Polignac number, because 28566453661 - 2³ = 28566453653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28566453599 and 28566453608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28566453361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14283226830 + 14283226831.

It is an arithmetic number, because the mean of its divisors is an integer number (14283226831).

Almost surely, 2^28566453661 is an apocalyptic number.

It is an amenable number.

28566453661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28566453661 is an equidigital number, since it uses as much as digits as its factorization.

28566453661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6220800, while the sum is 52.

The spelling of 28566453661 in words is "twenty-eight billion, five hundred sixty-six million, four hundred fifty-three thousand, six hundred sixty-one".