868166645 has 6 divisors (see below), whose sum is σ = 1041879042. Its totient is φ = 694480608.

The previous prime is 868166633. The next prime is 868166669. The reversal of 868166645 is 546661868.

It can be written as a sum of positive squares in 3 ways, for example, as 177475684 + 690690961 = 13322^2 + 26281^2 .

It is not a de Polignac number, because 868166645 - 2¹⁰ = 868165621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 868166593 and 868166602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59297 + ... + 72473.

It is an arithmetic number, because the mean of its divisors is an integer number (173646507).

Almost surely, 2^868166645 is an apocalyptic number.

It is an amenable number.

868166645 is a deficient number, since it is larger than the sum of its proper divisors (173712397).

868166645 is an frugal number, since it uses more digits than its factorization.

868166645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26359 (or 13182 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 50.

The square root of 868166645 is about 29464.6677395147. The cubic root of 868166645 is about 953.9692267395.

The spelling of 868166645 in words is "eight hundred sixty-eight million, one hundred sixty-six thousand, six hundred forty-five".