787998707899789 has 2 divisors, whose sum is σ = 787998707899790. Its totient is φ = 787998707899788.

The previous prime is 787998707899787. The next prime is 787998707899813. The reversal of 787998707899789 is 987998707899787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662949462318025 + 125049245581764 = 25747805^2 + 11182542^2 .

It is a cyclic number.

It is not a de Polignac number, because 787998707899789 - 2¹ = 787998707899787 is a prime.

Together with 787998707899787, 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 (787998707899787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393999353949894 + 393999353949895.

It is an arithmetic number, because the mean of its divisors is an integer number (393999353949895).

Almost surely, 2^{787998707899789} is an apocalyptic number.

It is an amenable number.

787998707899789 is a deficient number, since it is larger than the sum of its proper divisors (1).

787998707899789 is an equidigital number, since it uses as much as digits as its factorization.

787998707899789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4065020080128, while the sum is 112.

The spelling of 787998707899789 in words is "seven hundred eighty-seven trillion, nine hundred ninety-eight billion, seven hundred seven million, eight hundred ninety-nine thousand, seven hundred eighty-nine".