85042431277 has 4 divisors (see below), whose sum is σ = 85043680540. Its totient is φ = 85041182016.

The previous prime is 85042431263. The next prime is 85042431283. The reversal of 85042431277 is 77213424058.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77213424058 = 2 ⋅38606712029.

It can be written as a sum of positive squares in 2 ways, for example, as 62154977481 + 22887453796 = 249309^2 + 151286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85042431277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85042471277) 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, 516252 + ... + 660757.

It is an arithmetic number, because the mean of its divisors is an integer number (21260920135).

Almost surely, 2^85042431277 is an apocalyptic number.

It is an amenable number.

85042431277 is a deficient number, since it is larger than the sum of its proper divisors (1249263).

85042431277 is a wasteful number, since it uses less digits than its factorization.

85042431277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249262.

The product of its (nonzero) digits is 376320, while the sum is 43.

The spelling of 85042431277 in words is "eighty-five billion, forty-two million, four hundred thirty-one thousand, two hundred seventy-seven".