85504617839 has 2 divisors, whose sum is σ = 85504617840. Its totient is φ = 85504617838.

The previous prime is 85504617799. The next prime is 85504617841. The reversal of 85504617839 is 93871640558.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85504617839 is a prime.

It is a super-2 number, since 2×85504617839² (a number of 23 digits) contains 22 as substring.

Together with 85504617841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85504617439) 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, 42752308919 + 42752308920.

It is an arithmetic number, because the mean of its divisors is an integer number (42752308920).

Almost surely, 2^85504617839 is an apocalyptic number.

85504617839 is a deficient number, since it is larger than the sum of its proper divisors (1).

85504617839 is an equidigital number, since it uses as much as digits as its factorization.

85504617839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 85504617839 in words is "eighty-five billion, five hundred four million, six hundred seventeen thousand, eight hundred thirty-nine".