999999787999999 has 2 divisors, whose sum is σ = 999999788000000. Its totient is φ = 999999787999998.

The previous prime is 999999787999997. The next prime is 999999788000033.

999999787999999 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 999999787999999 - 2¹ = 999999787999997 is a prime.

Together with 999999787999997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999787999997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999893999999 + 499999894000000.

It is an arithmetic number, because the mean of its divisors is an integer number (499999894000000).

Almost surely, 2^{999999787999999} is an apocalyptic number.

999999787999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999787999999 is an equidigital number, since it uses as much as digits as its factorization.

999999787999999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110712378300552, while the sum is 130.

The spelling of 999999787999999 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, seven hundred eighty-seven million, nine hundred ninety-nine thousand, nine hundred ninety-nine".