85501785709 has 2 divisors, whose sum is σ = 85501785710. Its totient is φ = 85501785708.

The previous prime is 85501785599. The next prime is 85501785727. The reversal of 85501785709 is 90758710558.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54286670025 + 31215115684 = 232995^2 + 176678^2 .

It is a cyclic number.

It is not a de Polignac number, because 85501785709 - 2¹⁹ = 85501261421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85501785709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85501785409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42750892854 + 42750892855.

It is an arithmetic number, because the mean of its divisors is an integer number (42750892855).

Almost surely, 2^85501785709 is an apocalyptic number.

It is an amenable number.

85501785709 is a deficient number, since it is larger than the sum of its proper divisors (1).

85501785709 is an equidigital number, since it uses as much as digits as its factorization.

85501785709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528000, while the sum is 55.

The spelling of 85501785709 in words is "eighty-five billion, five hundred one million, seven hundred eighty-five thousand, seven hundred nine".