10643516405266 has 4 divisors (see below), whose sum is σ = 15965274607902. Its totient is φ = 5321758202632.

The previous prime is 10643516405257. The next prime is 10643516405267. The reversal of 10643516405266 is 66250461534601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7307176706041 + 3336339699225 = 2703179^2 + 1826565^2 .

It is a super-2 number, since 2×10643516405266² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (10643516405267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2660879101315 + ... + 2660879101318.

Almost surely, 2^{10643516405266} is an apocalyptic number.

10643516405266 is a deficient number, since it is larger than the sum of its proper divisors (5321758202636).

10643516405266 is an equidigital number, since it uses as much as digits as its factorization.

10643516405266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5321758202635.

The product of its (nonzero) digits is 3110400, while the sum is 49.

Adding to 10643516405266 its reverse (66250461534601), we get a palindrome (76893977939867).

The spelling of 10643516405266 in words is "ten trillion, six hundred forty-three billion, five hundred sixteen million, four hundred five thousand, two hundred sixty-six".