161826213109 has 8 divisors (see below), whose sum is σ = 185829144480. Its totient is φ = 139371858000.

The previous prime is 161826213103. The next prime is 161826213121. The reversal of 161826213109 is 901312628161.

161826213109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161826213109 - 2⁵ = 161826213077 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 (161826213103) 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 7 ways as a sum of consecutive naturals, for example, 387143842 + ... + 387144259.

It is an arithmetic number, because the mean of its divisors is an integer number (23228643060).

Almost surely, 2^161826213109 is an apocalyptic number.

161826213109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

161826213109 is a deficient number, since it is larger than the sum of its proper divisors (24002931371).

161826213109 is a wasteful number, since it uses less digits than its factorization.

161826213109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774288131.

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 161826213109 in words is "one hundred sixty-one billion, eight hundred twenty-six million, two hundred thirteen thousand, one hundred nine".