10505807989 has 4 divisors (see below), whose sum is σ = 10868077260. Its totient is φ = 10143538720.

The previous prime is 10505807953. The next prime is 10505807993. The reversal of 10505807989 is 98970850501.

10505807989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2110667364 + 8395140625 = 45942^2 + 91625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10505807989 is a prime.

It is a super-2 number, since 2×10505807989² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10505807999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181134592 + ... + 181134649.

It is an arithmetic number, because the mean of its divisors is an integer number (2717019315).

Almost surely, 2^10505807989 is an apocalyptic number.

It is an amenable number.

10505807989 is a deficient number, since it is larger than the sum of its proper divisors (362269271).

10505807989 is an equidigital number, since it uses as much as digits as its factorization.

10505807989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362269270.

The product of its (nonzero) digits is 907200, while the sum is 52.

The spelling of 10505807989 in words is "ten billion, five hundred five million, eight hundred seven thousand, nine hundred eighty-nine".