10663403521 has 4 divisors (see below), whose sum is σ = 10664630532. Its totient is φ = 10662176512.

The previous prime is 10663403479. The next prime is 10663403557. The reversal of 10663403521 is 12530436601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12530436601 = 63443 ⋅197507.

It can be written as a sum of positive squares in 2 ways, for example, as 5675512896 + 4987890625 = 75336^2 + 70625^2 .

It is a cyclic number.

It is not a de Polignac number, because 10663403521 - 2²³ = 10655014913 is a prime.

It is a super-2 number, since 2×10663403521² (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 (10663403581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600376 + ... + 617881.

It is an arithmetic number, because the mean of its divisors is an integer number (2666157633).

Almost surely, 2^10663403521 is an apocalyptic number.

It is an amenable number.

10663403521 is a deficient number, since it is larger than the sum of its proper divisors (1227011).

10663403521 is an equidigital number, since it uses as much as digits as its factorization.

10663403521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227010.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 10663403521 in words is "ten billion, six hundred sixty-three million, four hundred three thousand, five hundred twenty-one".