6855166909 has 4 divisors (see below), whose sum is σ = 6856799040. Its totient is φ = 6853534780.

The previous prime is 6855166891. The next prime is 6855166939. The reversal of 6855166909 is 9096615586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6855166909 - 2¹⁵ = 6855134141 is a prime.

It is a super-2 number, since 2×6855166909² = 93986626700497228562, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6855166909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6855166939) 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, 809749 + ... + 818170.

It is an arithmetic number, because the mean of its divisors is an integer number (1714199760).

Almost surely, 2^6855166909 is an apocalyptic number.

It is an amenable number.

6855166909 is a deficient number, since it is larger than the sum of its proper divisors (1632131).

6855166909 is a wasteful number, since it uses less digits than its factorization.

6855166909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632130.

The product of its (nonzero) digits is 3499200, while the sum is 55.

The square root of 6855166909 is about 82795.9353410540. The cubic root of 6855166909 is about 1899.6460013618.

It can be divided in two parts, 68551 and 66909, that added together give a triangular number (135460 = T₅₂₀).

The spelling of 6855166909 in words is "six billion, eight hundred fifty-five million, one hundred sixty-six thousand, nine hundred nine".