28666261550443 has 12 divisors (see below), whose sum is σ = 31511627134624. Its totient is φ = 26058227540400.

The previous prime is 28666261550363. The next prime is 28666261550473. The reversal of 28666261550443 is 34405516266682.

It is not a de Polignac number, because 28666261550443 - 2³⁷ = 28528822596971 is a prime.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28666261550473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7561203 + ... + 10700668.

Almost surely, 2^{28666261550443} is an apocalyptic number.

28666261550443 is a deficient number, since it is larger than the sum of its proper divisors (2845365584181).

28666261550443 is a wasteful number, since it uses less digits than its factorization.

28666261550443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18274866 (or 18274855 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 58.

The spelling of 28666261550443 in words is "twenty-eight trillion, six hundred sixty-six billion, two hundred sixty-one million, five hundred fifty thousand, four hundred forty-three".