10520356545 has 20 divisors (see below), whose sum is σ = 18858713940. Its totient is φ = 5610856608.

The previous prime is 10520356537. The next prime is 10520356547. The reversal of 10520356545 is 54565302501.

10520356545 is a `hidden beast` number, since 1 + 0 + 52 + 0 + 3 + 565 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1293409296 + 9226947249 = 35964^2 + 96057^2 .

It is not a de Polignac number, because 10520356545 - 2³ = 10520356537 is a prime.

It is a super-5 number, since 5×10520356545⁵ (a number of 51 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (10520356547) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12987690 + ... + 12988499.

It is an arithmetic number, because the mean of its divisors is an integer number (942935697).

Almost surely, 2^10520356545 is an apocalyptic number.

10520356545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10520356545 is a deficient number, since it is larger than the sum of its proper divisors (8338357395).

10520356545 is an equidigital number, since it uses as much as digits as its factorization.

10520356545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25976206 (or 25976197 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The spelling of 10520356545 in words is "ten billion, five hundred twenty million, three hundred fifty-six thousand, five hundred forty-five".