5006651666021 has 2 divisors, whose sum is σ = 5006651666022. Its totient is φ = 5006651666020.

The previous prime is 5006651665979. The next prime is 5006651666039. The reversal of 5006651666021 is 1206661566005.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3885191845921 + 1121459820100 = 1971089^2 + 1058990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5006651666021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5006651665021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2503325833010 + 2503325833011.

It is an arithmetic number, because the mean of its divisors is an integer number (2503325833011).

Almost surely, 2^{5006651666021} is an apocalyptic number.

It is an amenable number.

5006651666021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5006651666021 is an equidigital number, since it uses as much as digits as its factorization.

5006651666021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 5006651666021 in words is "five trillion, six billion, six hundred fifty-one million, six hundred sixty-six thousand, twenty-one".