85820239577 has 4 divisors (see below), whose sum is σ = 86316310500. Its totient is φ = 85324168656.

The previous prime is 85820239573. The next prime is 85820239649. The reversal of 85820239577 is 77593202858.

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 49472435776 + 36347803801 = 222424^2 + 190651^2 .

It is a cyclic number.

It is not a de Polignac number, because 85820239577 - 2² = 85820239573 is a prime.

It is a super-2 number, since 2×85820239577² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85820239573) 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 in 3 ways as a sum of consecutive naturals, for example, 248035202 + ... + 248035547.

It is an arithmetic number, because the mean of its divisors is an integer number (21579077625).

Almost surely, 2^85820239577 is an apocalyptic number.

It is an amenable number.

85820239577 is a deficient number, since it is larger than the sum of its proper divisors (496070923).

85820239577 is a wasteful number, since it uses less digits than its factorization.

85820239577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496070922.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 85820239577 in words is "eighty-five billion, eight hundred twenty million, two hundred thirty-nine thousand, five hundred seventy-seven".