128563539866 has 8 divisors (see below), whose sum is σ = 193427925024. Its totient is φ = 64087564860.

The previous prime is 128563539857. The next prime is 128563539889. The reversal of 128563539866 is 668935365821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128563539799 and 128563539808.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97101710 + ... + 97103033.

It is an arithmetic number, because the mean of its divisors is an integer number (24178490628).

Almost surely, 2^128563539866 is an apocalyptic number.

128563539866 is a deficient number, since it is larger than the sum of its proper divisors (64864385158).

128563539866 is a wasteful number, since it uses less digits than its factorization.

128563539866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194205076.

The product of its digits is 55987200, while the sum is 62.

The spelling of 128563539866 in words is "one hundred twenty-eight billion, five hundred sixty-three million, five hundred thirty-nine thousand, eight hundred sixty-six".