78857739743 has 2 divisors, whose sum is σ = 78857739744. Its totient is φ = 78857739742.

The previous prime is 78857739721. The next prime is 78857739769. The reversal of 78857739743 is 34793775887.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78857739743 - 2⁶ = 78857739679 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78857739143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39428869871 + 39428869872.

It is an arithmetic number, because the mean of its divisors is an integer number (39428869872).

Almost surely, 2^78857739743 is an apocalyptic number.

78857739743 is a deficient number, since it is larger than the sum of its proper divisors (1).

78857739743 is an equidigital number, since it uses as much as digits as its factorization.

78857739743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248935680, while the sum is 68.

The spelling of 78857739743 in words is "seventy-eight billion, eight hundred fifty-seven million, seven hundred thirty-nine thousand, seven hundred forty-three".