999966000996649 has 2 divisors, whose sum is σ = 999966000996650. Its totient is φ = 999966000996648.

The previous prime is 999966000996593. The next prime is 999966000996791. The reversal of 999966000996649 is 946699000669999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588869816889600 + 411096184107049 = 24266640^2 + 20275507^2 .

It is a cyclic number.

It is not a de Polignac number, because 999966000996649 - 2¹¹ = 999966000994601 is a prime.

It is a super-2 number, since 2×999966000996649² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999966000996049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499983000498324 + 499983000498325.

It is an arithmetic number, because the mean of its divisors is an integer number (499983000498325).

Almost surely, 2^{999966000996649} is an apocalyptic number.

It is an amenable number.

999966000996649 is a deficient number, since it is larger than the sum of its proper divisors (1).

999966000996649 is an equidigital number, since it uses as much as digits as its factorization.

999966000996649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24794911296, while the sum is 91.

The spelling of 999966000996649 in words is "nine hundred ninety-nine trillion, nine hundred sixty-six billion, nine hundred ninety-six thousand, six hundred forty-nine".