10520530660861 has 4 divisors (see below), whose sum is σ = 11329802250172. Its totient is φ = 9711259071552.

The previous prime is 10520530660859. The next prime is 10520530660873. The reversal of 10520530660861 is 16806603502501.

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 476004784761 + 10044525876100 = 689931^2 + 3169310^2 .

It is a cyclic number.

It is not a de Polignac number, because 10520530660861 - 2¹ = 10520530660859 is a prime.

It is a super-2 number, since 2×10520530660861² (a number of 27 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 (10520530660891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404635794636 + ... + 404635794661.

It is an arithmetic number, because the mean of its divisors is an integer number (2832450562543).

Almost surely, 2^{10520530660861} is an apocalyptic number.

It is an amenable number.

10520530660861 is a deficient number, since it is larger than the sum of its proper divisors (809271589311).

10520530660861 is an equidigital number, since it uses as much as digits as its factorization.

10520530660861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809271589310.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 10520530660861 in words is "ten trillion, five hundred twenty billion, five hundred thirty million, six hundred sixty thousand, eight hundred sixty-one".