10663516521 has 24 divisors (see below), whose sum is σ = 17866007744. Its totient is φ = 6002488800.

The previous prime is 10663516517. The next prime is 10663516541. The reversal of 10663516521 is 12561536601.

10663516521 is a `hidden beast` number, since 1 + 0 + 6 + 635 + 16 + 5 + 2 + 1 = 666.

It is not a de Polignac number, because 10663516521 - 2² = 10663516517 is a prime.

It is a super-2 number, since 2×10663516521² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10663516541) 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, 1258930 + ... + 1267371.

Almost surely, 2^10663516521 is an apocalyptic number.

It is an amenable number.

10663516521 is a deficient number, since it is larger than the sum of its proper divisors (7202491223).

10663516521 is a wasteful number, since it uses less digits than its factorization.

10663516521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526381 (or 2526378 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 10663516521 in words is "ten billion, six hundred sixty-three million, five hundred sixteen thousand, five hundred twenty-one".