185106386809 has 8 divisors (see below), whose sum is σ = 195311660480. Its totient is φ = 174947396400.

The previous prime is 185106386797. The next prime is 185106386837. The reversal of 185106386809 is 908683601581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 185106386809 - 2¹⁹ = 185105862521 is a prime.

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 185106386809.

It is not an unprimeable number, because it can be changed into a prime (185106186809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11562597 + ... + 11578594.

It is an arithmetic number, because the mean of its divisors is an integer number (24413957560).

Almost surely, 2^185106386809 is an apocalyptic number.

185106386809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

185106386809 is a deficient number, since it is larger than the sum of its proper divisors (10205273671).

185106386809 is a wasteful number, since it uses less digits than its factorization.

185106386809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23141631.

The product of its (nonzero) digits is 2488320, while the sum is 55.

It can be divided in two parts, 185106 and 386809, that added together give a triangular number (571915 = T₁₀₆₉).

The spelling of 185106386809 in words is "one hundred eighty-five billion, one hundred six million, three hundred eighty-six thousand, eight hundred nine".