86187189877 has 4 divisors (see below), whose sum is σ = 86685381900. Its totient is φ = 85688997856.

The previous prime is 86187189871. The next prime is 86187189971. The reversal of 86187189877 is 77898178168.

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 75037097041 + 11150092836 = 273929^2 + 105594^2 .

It is a cyclic number.

It is not a de Polignac number, because 86187189877 - 2²⁷ = 86052972149 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 (86187189871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249095752 + ... + 249096097.

It is an arithmetic number, because the mean of its divisors is an integer number (21671345475).

Almost surely, 2^86187189877 is an apocalyptic number.

It is an amenable number.

86187189877 is a deficient number, since it is larger than the sum of its proper divisors (498192023).

86187189877 is a wasteful number, since it uses less digits than its factorization.

86187189877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498192022.

The product of its digits is 75866112, while the sum is 70.

The spelling of 86187189877 in words is "eighty-six billion, one hundred eighty-seven million, one hundred eighty-nine thousand, eight hundred seventy-seven".