85520086777 has 2 divisors, whose sum is σ = 85520086778. Its totient is φ = 85520086776.

The previous prime is 85520086759. The next prime is 85520086783. The reversal of 85520086777 is 77768002558.

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., 57451775481 + 28068311296 = 239691^2 + 167536^2 .

It is a cyclic number.

It is not a de Polignac number, because 85520086777 - 2³⁵ = 51160348409 is a prime.

It is a super-2 number, since 2×85520086777² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85520086747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42760043388 + 42760043389.

It is an arithmetic number, because the mean of its divisors is an integer number (42760043389).

Almost surely, 2^85520086777 is an apocalyptic number.

It is an amenable number.

85520086777 is a deficient number, since it is larger than the sum of its proper divisors (1).

85520086777 is an equidigital number, since it uses as much as digits as its factorization.

85520086777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6585600, while the sum is 55.

The spelling of 85520086777 in words is "eighty-five billion, five hundred twenty million, eighty-six thousand, seven hundred seventy-seven".