868186505 has 4 divisors (see below), whose sum is σ = 1041823812. Its totient is φ = 694549200.

The previous prime is 868186453. The next prime is 868186507. The reversal of 868186505 is 505681868.

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 511845376 + 356341129 = 22624^2 + 18877^2 .

It is not a de Polignac number, because 868186505 - 2⁶ = 868186441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 868186505.

It is not an unprimeable number, because it can be changed into a prime (868186507) 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, 86818646 + ... + 86818655.

It is an arithmetic number, because the mean of its divisors is an integer number (260455953).

Almost surely, 2^868186505 is an apocalyptic number.

It is an amenable number.

868186505 is a deficient number, since it is larger than the sum of its proper divisors (173637307).

868186505 is a wasteful number, since it uses less digits than its factorization.

868186505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173637306.

The product of its (nonzero) digits is 460800, while the sum is 47.

The square root of 868186505 is about 29465.0047513996. The cubic root of 868186505 is about 953.9765009514.

The spelling of 868186505 in words is "eight hundred sixty-eight million, one hundred eighty-six thousand, five hundred five".