10781857809 has 16 divisors (see below), whose sum is σ = 15979059840. Its totient is φ = 7185233520.

The previous prime is 10781857799. The next prime is 10781857813. The reversal of 10781857809 is 90875818701.

It is not a de Polignac number, because 10781857809 - 2⁵ = 10781857777 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (10781857309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1164 + ... + 146850.

It is an arithmetic number, because the mean of its divisors is an integer number (998691240).

Almost surely, 2^10781857809 is an apocalyptic number.

It is an amenable number.

10781857809 is a deficient number, since it is larger than the sum of its proper divisors (5197202031).

10781857809 is a wasteful number, since it uses less digits than its factorization.

10781857809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148437 (or 148431 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 54.

The spelling of 10781857809 in words is "ten billion, seven hundred eighty-one million, eight hundred fifty-seven thousand, eight hundred nine".