161826213105 has 48 divisors (see below), whose sum is σ = 292883273280. Its totient is φ = 82552331904.

The previous prime is 161826213103. The next prime is 161826213121. The reversal of 161826213105 is 501312628161.

161826213105 is a `hidden beast` number, since 1 + 6 + 18 + 2 + 621 + 3 + 10 + 5 = 666.

It is not a de Polignac number, because 161826213105 - 2¹ = 161826213103 is a prime.

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 161826213105.

It is not an unprimeable number, because it can be changed into a prime (161826213103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 439827 + ... + 719096.

It is an arithmetic number, because the mean of its divisors is an integer number (6101734860).

Almost surely, 2^161826213105 is an apocalyptic number.

161826213105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161826213105 is a deficient number, since it is larger than the sum of its proper divisors (131057060175).

161826213105 is a wasteful number, since it uses less digits than its factorization.

161826213105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159070 (or 1159067 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 161826213105 in words is "one hundred sixty-one billion, eight hundred twenty-six million, two hundred thirteen thousand, one hundred five".