10520345809 has 4 divisors (see below), whose sum is σ = 11074048240. Its totient is φ = 9966643380.

The previous prime is 10520345779. The next prime is 10520345813. The reversal of 10520345809 is 90854302501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10520345809 - 2⁵ = 10520345777 is a prime.

It is a super-2 number, since 2×10520345809² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10520145809) 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 in 3 ways as a sum of consecutive naturals, for example, 276851187 + ... + 276851224.

It is an arithmetic number, because the mean of its divisors is an integer number (2768512060).

Almost surely, 2^10520345809 is an apocalyptic number.

10520345809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

10520345809 is a deficient number, since it is larger than the sum of its proper divisors (553702431).

10520345809 is an equidigital number, since it uses as much as digits as its factorization.

10520345809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553702430.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 10520345809 in words is "ten billion, five hundred twenty million, three hundred forty-five thousand, eight hundred nine".