85687051771 has 4 divisors (see below), whose sum is σ = 86054807592. Its totient is φ = 85319295952.

The previous prime is 85687051763. The next prime is 85687051781. The reversal of 85687051771 is 17715078658.

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

It is a cyclic number.

It is not a de Polignac number, because 85687051771 - 2³ = 85687051763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85687051781) 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, 183877561 + ... + 183878026.

It is an arithmetic number, because the mean of its divisors is an integer number (21513701898).

Almost surely, 2^85687051771 is an apocalyptic number.

85687051771 is a deficient number, since it is larger than the sum of its proper divisors (367755821).

85687051771 is a wasteful number, since it uses less digits than its factorization.

85687051771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367755820.

The product of its (nonzero) digits is 3292800, while the sum is 55.

The spelling of 85687051771 in words is "eighty-five billion, six hundred eighty-seven million, fifty-one thousand, seven hundred seventy-one".