161782824906 has 56 divisors (see below), whose sum is σ = 365569991424. Its totient is φ = 53671925160.

The previous prime is 161782824901. The next prime is 161782824979. The reversal of 161782824906 is 609428287161.

It is a happy number.

161782824906 is a `hidden beast` number, since 1 + 6 + 1 + 78 + 2 + 82 + 490 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (161782824901) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 44695 + ... + 570581.

Almost surely, 2^161782824906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161782824906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182784995712).

161782824906 is an abundant number, since it is smaller than the sum of its proper divisors (203787166518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161782824906 is an equidigital number, since it uses as much as digits as its factorization.

161782824906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526118 (or 526103 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 161782824906 in words is "one hundred sixty-one billion, seven hundred eighty-two million, eight hundred twenty-four thousand, nine hundred six".