10556515521 has 6 divisors (see below), whose sum is σ = 15248300210. Its totient is φ = 7037677008.

The previous prime is 10556515493. The next prime is 10556515531. The reversal of 10556515521 is 12551565501.

10556515521 is a `hidden beast` number, since 1 + 0 + 5 + 56 + 51 + 552 + 1 = 666.

10556515521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8102700225 + 2453815296 = 90015^2 + 49536^2 .

It is not a de Polignac number, because 10556515521 - 2⁶ = 10556515457 is a prime.

It is a super-2 number, since 2×10556515521² (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 (10556515531) 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 5 ways as a sum of consecutive naturals, for example, 586473076 + ... + 586473093.

Almost surely, 2^10556515521 is an apocalyptic number.

It is an amenable number.

10556515521 is a deficient number, since it is larger than the sum of its proper divisors (4691784689).

10556515521 is a wasteful number, since it uses less digits than its factorization.

10556515521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172946175 (or 1172946172 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 36.

The spelling of 10556515521 in words is "ten billion, five hundred fifty-six million, five hundred fifteen thousand, five hundred twenty-one".