85142243779 has 2 divisors, whose sum is σ = 85142243780. Its totient is φ = 85142243778.

The previous prime is 85142243713. The next prime is 85142243833. The reversal of 85142243779 is 97734224158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85142243779 - 2¹⁹ = 85141719491 is a prime.

It is not a weakly prime, because it can be changed into another prime (85142643779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42571121889 + 42571121890.

It is an arithmetic number, because the mean of its divisors is an integer number (42571121890).

Almost surely, 2^85142243779 is an apocalyptic number.

85142243779 is a deficient number, since it is larger than the sum of its proper divisors (1).

85142243779 is an equidigital number, since it uses as much as digits as its factorization.

85142243779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 52.

The spelling of 85142243779 in words is "eighty-five billion, one hundred forty-two million, two hundred forty-three thousand, seven hundred seventy-nine".