78820896571 has 2 divisors, whose sum is σ = 78820896572. Its totient is φ = 78820896570.

The previous prime is 78820896533. The next prime is 78820896619. The reversal of 78820896571 is 17569802887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78820896571 - 2⁷ = 78820896443 is a prime.

It is not a weakly prime, because it can be changed into another prime (78820896071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39410448285 + 39410448286.

It is an arithmetic number, because the mean of its divisors is an integer number (39410448286).

Almost surely, 2^78820896571 is an apocalyptic number.

78820896571 is a deficient number, since it is larger than the sum of its proper divisors (1).

78820896571 is an equidigital number, since it uses as much as digits as its factorization.

78820896571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13547520, while the sum is 61.

The spelling of 78820896571 in words is "seventy-eight billion, eight hundred twenty million, eight hundred ninety-six thousand, five hundred seventy-one".