28566512501 has 2 divisors, whose sum is σ = 28566512502. Its totient is φ = 28566512500.

The previous prime is 28566512489. The next prime is 28566512531. The reversal of 28566512501 is 10521566582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27846931876 + 719580625 = 166874^2 + 26825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28566512501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28566512531) 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, 14283256250 + 14283256251.

It is an arithmetic number, because the mean of its divisors is an integer number (14283256251).

Almost surely, 2^28566512501 is an apocalyptic number.

It is an amenable number.

28566512501 is a deficient number, since it is larger than the sum of its proper divisors (1).

28566512501 is an equidigital number, since it uses as much as digits as its factorization.

28566512501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 41.

The spelling of 28566512501 in words is "twenty-eight billion, five hundred sixty-six million, five hundred twelve thousand, five hundred one".