10666623521 has 2 divisors, whose sum is σ = 10666623522. Its totient is φ = 10666623520.

The previous prime is 10666623469. The next prime is 10666623557. The reversal of 10666623521 is 12532666601.

It is a happy number.

10666623521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8843333521 + 1823290000 = 94039^2 + 42700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10666623521 is a prime.

It is a super-2 number, since 2×10666623521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10666622521) 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 as a sum of consecutive naturals, namely, 5333311760 + 5333311761.

It is an arithmetic number, because the mean of its divisors is an integer number (5333311761).

Almost surely, 2^10666623521 is an apocalyptic number.

It is an amenable number.

10666623521 is a deficient number, since it is larger than the sum of its proper divisors (1).

10666623521 is an equidigital number, since it uses as much as digits as its factorization.

10666623521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 10666623521 in words is "ten billion, six hundred sixty-six million, six hundred twenty-three thousand, five hundred twenty-one".