85781785823 has 2 divisors, whose sum is σ = 85781785824. Its totient is φ = 85781785822.

The previous prime is 85781785819. The next prime is 85781785841. The reversal of 85781785823 is 32858718758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85781785823 - 2² = 85781785819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85781185823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42890892911 + 42890892912.

It is an arithmetic number, because the mean of its divisors is an integer number (42890892912).

Almost surely, 2^85781785823 is an apocalyptic number.

85781785823 is a deficient number, since it is larger than the sum of its proper divisors (1).

85781785823 is an equidigital number, since it uses as much as digits as its factorization.

85781785823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30105600, while the sum is 62.

The spelling of 85781785823 in words is "eighty-five billion, seven hundred eighty-one million, seven hundred eighty-five thousand, eight hundred twenty-three".