999999649916807 has 2 divisors, whose sum is σ = 999999649916808. Its totient is φ = 999999649916806.

The previous prime is 999999649916801. The next prime is 999999649916837. The reversal of 999999649916807 is 708619946999999.

It is a weak prime.

It is an emirp because it is prime and its reverse (708619946999999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999999649916807 - 2⁸ = 999999649916551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999649916801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999824958403 + 499999824958404.

It is an arithmetic number, because the mean of its divisors is an integer number (499999824958404).

Almost surely, 2^{999999649916807} is an apocalyptic number.

999999649916807 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999649916807 is an equidigital number, since it uses as much as digits as its factorization.

999999649916807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 347128758144, while the sum is 104.

The spelling of 999999649916807 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, six hundred forty-nine million, nine hundred sixteen thousand, eight hundred seven".