85508424557 has 4 divisors (see below), whose sum is σ = 85512442236. Its totient is φ = 85504406880.

The previous prime is 85508424523. The next prime is 85508424569. The reversal of 85508424557 is 75542480558.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82632676681 + 2875747876 = 287459^2 + 53626^2 .

It is a cyclic number.

It is not a de Polignac number, because 85508424557 - 2¹⁴ = 85508408173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85508424499 and 85508424508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85508424517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1976744 + ... + 2019537.

It is an arithmetic number, because the mean of its divisors is an integer number (21378110559).

Almost surely, 2^85508424557 is an apocalyptic number.

It is an amenable number.

85508424557 is a deficient number, since it is larger than the sum of its proper divisors (4017679).

85508424557 is a wasteful number, since it uses less digits than its factorization.

85508424557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4017678.

The product of its (nonzero) digits is 8960000, while the sum is 53.

The spelling of 85508424557 in words is "eighty-five billion, five hundred eight million, four hundred twenty-four thousand, five hundred fifty-seven".