10645543521 has 24 divisors (see below), whose sum is σ = 15647860800. Its totient is φ = 6973044000.

The previous prime is 10645543501. The next prime is 10645543603. The reversal of 10645543521 is 12534554601.

10645543521 is a `hidden beast` number, since 1 + 0 + 64 + 5 + 543 + 52 + 1 = 666.

It is not a de Polignac number, because 10645543521 - 2¹⁰ = 10645542497 is a prime.

It is a super-2 number, since 2×10645543521² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10645543501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74380 + ... + 163778.

It is an arithmetic number, because the mean of its divisors is an integer number (651994200).

Almost surely, 2^10645543521 is an apocalyptic number.

It is an amenable number.

10645543521 is a deficient number, since it is larger than the sum of its proper divisors (5002317279).

10645543521 is a wasteful number, since it uses less digits than its factorization.

10645543521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89637 (or 89634 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 10645543521 in words is "ten billion, six hundred forty-five million, five hundred forty-three thousand, five hundred twenty-one".